阅读说明：本技术 半导体存储装置 (Semiconductor memory device with a plurality of memory cells ) 是由 原島弘光 亀田靖 于 2020-01-06 设计创作，主要内容包括：实施方式提供一种能够提高动作的可靠性的半导体存储装置。实施方式的半导体存储装置具备存储器阵列芯片(300)及周边电路芯片(200),该存储器阵列芯片(300)包含：多个存储单元,设置在第1衬底；多个第1焊垫,设置在第1衬底上,且以包围多个存储单元的方式配置；及第1导电层,设置在第1衬底上,且电连接于第1焊垫；该周边电路芯片(200)包含：周边电路,设置在第2衬底；多个第2焊垫,设置在第2衬底上,且以包围周边电路的方式配置；及第2导电层,设置在第2衬底上,且电连接于第2焊垫。存储器阵列芯片(300)的第1焊垫与周边电路芯片的第2焊垫以对向的方式贴合。(Embodiments provide a semiconductor memory device capable of improving operation reliability. A semiconductor memory device according to an embodiment includes a memory array chip (300) and a peripheral circuit chip (200), the memory array chip (300) including: a plurality of memory cells disposed on a1 st substrate; a plurality of 1 st pads provided on the 1 st substrate and arranged so as to surround the plurality of memory cells; and the 1 st conducting layer, set up on the 1 st substrate, and connect electrically to the 1 st pad; the peripheral circuit chip (200) includes: a peripheral circuit provided on the No. 2 substrate; a plurality of 2 nd pads provided on the 2 nd substrate and arranged so as to surround the peripheral circuit; and a2 nd conductive layer disposed on the 2 nd substrate and electrically connected to the 2 nd pad. The 1 st pad of the memory array chip (300) is attached to the 2 nd pad of the peripheral circuit chip in an opposite manner.)

1. A semiconductor memory device includes a1 st chip and a2 nd chip, the 1 st chip including: a plurality of memory cells disposed on a1 st substrate;

a plurality of 1 st pads provided on the 1 st substrate and arranged so as to surround the plurality of memory cells; and

the 1 st conducting layer is arranged on the 1 st substrate and is electrically connected with the 1 st welding pad;

the 2 nd chip includes: the 1 st circuit is arranged on the 2 nd substrate;

a plurality of 2 nd pads provided on the 2 nd substrate and arranged so as to surround the 1 st circuit; and

the 2 nd conducting layer is arranged on the 2 nd substrate and is electrically connected with the 2 nd welding pad;

the 1 st pad of the 1 st chip is attached to the 2 nd pad of the 2 nd chip in an opposite manner.

2. The semiconductor memory device according to claim 1, wherein the 1 st pad, the 1 st conductive layer, the 2 nd pad, and the 2 nd conductive layer constitute a TEG (test element group).

3. The semiconductor memory device according to claim 1 or 2, wherein the 1 st pad, the 1 st conductive layer, the 2 nd pad, and the 2 nd conductive layer constitute a pattern for testing electrically insulated from the memory cell and the 1 st circuit.

4. The semiconductor memory device according to claim 1, wherein the 1 st pad is disposed near an end of the 1 st chip, and the 2 nd pad is disposed near an end of the 2 nd chip.

5. The semiconductor memory device according to claim 1, wherein the 1 st chip further comprises a plurality of 3 rd pads provided on a surface opposite to the 1 st pad, and wherein the 1 st chip further comprises

The 3 rd pad is electrically connected to the 1 st pad.

6. The semiconductor memory device according to claim 5, wherein the peeling between the 1 st pad and the 2 nd pad is detected by measuring resistance using the 3 rd pad.

7. The semiconductor memory device according to claim 1, wherein the 1 st chip further comprises: a plurality of 3 rd pads disposed on the 1 st substrate so as to surround the 1 st pad and be adjacent to the 1 st pad; and the 3 rd conducting layer, set up on the said 1 st substrate and connect electrically to the said 3 rd pad; and is

The 2 nd chip further includes: a plurality of 4 th pads disposed on the 2 nd substrate so as to surround the 2 nd pad and be adjacent to the 2 nd pad; and a4 th conductive layer disposed on the 2 nd substrate and electrically connected to the 4 th pad.

8. The semiconductor memory device according to claim 7, wherein the 1 st chip further includes a 5 th pad provided on a surface opposite to the 3 rd pad,

the 5 th pad is electrically connected to the 3 rd conductive layer,

the 2 nd chip further includes a 6 th pad provided on a surface opposite to the 4 th pad

The 6 th pad is electrically connected to the 4 th conductive layer.

9. The semiconductor memory device according to claim 7, wherein the 1 st chip further comprises: a plurality of 5 th pads provided on the 1 st substrate and arranged adjacent to the 1 st pad; and the 5 th conducting layer, set up on the said 1 st substrate and connect electrically to the said 5 th pad; the 1 st pad is disposed between the 3 rd pad and the 5 th pad

The 2 nd chip further includes: a plurality of 6 th pads provided on the 2 nd substrate and arranged adjacent to the 2 nd pad; and the 6 th conducting layer, set up on said 2 nd substrate and connect electrically to said 6 th pad; the 2 nd pad is disposed between the 4 th pad and the 6 th pad.

Technical Field

Embodiments relate to a semiconductor memory device.

Background

A semiconductor memory device in which memory cells are arranged three-dimensionally is known.

Disclosure of Invention

Embodiments provide a semiconductor memory device capable of improving operation reliability.

The semiconductor memory device of the embodiment includes a1 st chip and a2 nd chip, the 1 st chip includes: a plurality of memory cells disposed on a1 st substrate; a plurality of 1 st pads provided on the 1 st substrate and arranged so as to surround the plurality of memory cells; and 1 st conducting layer, set up on the said 1 st substrate, and connect electrically to the said 1 st pad; the 2 nd chip includes: the 1 st circuit is arranged on the 2 nd substrate; a plurality of 2 nd pads provided on the 2 nd substrate and arranged so as to surround the 1 st circuit; and the 2 nd conducting layer is arranged on the 2 nd substrate and is electrically connected with the 2 nd welding pad. The 1 st pad of the 1 st chip is attached to the 2 nd pad of the 2 nd chip in an opposite manner.

Drawings

Fig. 1A is a top view of a region corresponding to 1 mask on a wafer including memory array chips according to embodiment 1.

Fig. 1B is a plan view of a region corresponding to 1 mask on a wafer including peripheral circuit chips according to embodiment 1.

Fig. 2 is a plan view showing a pattern of end regions and scribe lines provided in the semiconductor memory device.

Fig. 3 is a block diagram showing a circuit configuration of a memory cell region and a peripheral circuit region in the semiconductor memory device.

Fig. 4 is a circuit diagram of a block within a memory cell array in the semiconductor memory apparatus.

Fig. 5 is a cross-sectional view of NAND strings within a block in the semiconductor memory device.

Fig. 6 is a sectional view taken along line a1-a1 in fig. 2.

Fig. 7 is a sectional view taken along line a2-a2 in fig. 2.

Fig. 8 is a sectional view taken along line A3-A3 in fig. 2.

Fig. 9 is a sectional view taken along line a4-a4 in fig. 2.

Fig. 10 is a cross-sectional view of a memory cell region and an end region of another example of the semiconductor memory device.

Fig. 11 is a cross-sectional view of a boundary between a memory cell region and a peripheral circuit region in the semiconductor memory device.

Fig. 12 is a plan view showing a chain wiring and an adjacent wiring provided in an end region of the semiconductor memory device.

Fig. 13 is a sectional view taken along line B1-B1 in fig. 12.

Fig. 14 is a sectional view taken along line B2-B2 in fig. 12.

Fig. 15 is a sectional view taken along line B3-B3 in fig. 12.

Fig. 16 is a sectional view taken along line B4-B4 in fig. 12.

Fig. 17 is a plan view showing a chain wiring and an adjacent wiring provided in an end region in embodiment 2.

Fig. 18 is a sectional view taken along line C1-C1 in fig. 17.

Fig. 19 is a sectional view taken along line C2-C2 in fig. 17.

Fig. 20 is a sectional view taken along line C3-C3 in fig. 17.

Fig. 21 is a sectional view taken along line C4-C4 in fig. 17.

Fig. 22 is a plan view showing a chain wiring and an adjacent wiring provided in the end region in embodiment 3.

Fig. 23 is a sectional view taken along line D1-D1 in fig. 22.

Fig. 24 is a sectional view taken along line D2-D2 in fig. 22.

Fig. 25 is a sectional view taken along line D3-D3 in fig. 22.

Fig. 26 is a sectional view taken along line D4-D4 in fig. 22.

Fig. 27 is a sectional view taken along line D5-D5 in fig. 22.

Fig. 28 is a plan view showing a chain wiring and an adjacent wiring provided in an end region in embodiment 4.

Fig. 29 is a sectional view taken along line E1-E1 in fig. 28.

Fig. 30 is a sectional view taken along line E2-E2 in fig. 28.

Fig. 31 is a sectional view taken along line E3-E3 in fig. 28.

Fig. 32 is a sectional view taken along line E4-E4 in fig. 28.

Fig. 33 is a sectional view taken along line E5-E5 in fig. 28.

Detailed Description

Hereinafter, embodiments will be described with reference to the drawings. In the following description, components having the same functions and configurations are denoted by common reference numerals. The embodiments described below are illustrative of apparatuses and methods for embodying the technical ideas of the embodiments, and the materials, shapes, structures, arrangements, and the like of the components are not specified below.

Here, a three-dimensional multilayer NAND flash memory in which memory cell transistors are stacked above a semiconductor substrate will be described as an example of a semiconductor memory device. In this specification, a memory cell transistor may be referred to as a memory cell.

1. Embodiment 1

The semiconductor memory device according to embodiment 1 will be described below.

1.1 construction of embodiment 1

The layout structure, circuit structure, and cross-sectional structure of the semiconductor memory device according to embodiment 1 will be described in order below.

1.1.1 layout Structure of semiconductor memory device

Fig. 1A and 1B are plan views of regions corresponding to 1 mask (or reticle) on a wafer of a memory array chip and a peripheral circuit chip included in the semiconductor memory device according to embodiment 1. More specifically, fig. 1A is a top view of an area equivalent to 1 mask (or reticle) on a wafer including the memory array chip 300, and fig. 1B is a top view of an area equivalent to 1 mask (or reticle) on a wafer including the peripheral circuit chip 200. In the lower drawings including fig. 1A and 1B, 2 directions parallel to the wafer plane or the semiconductor substrate plane and orthogonal to each other are defined as X-direction and Y-direction, and a direction orthogonal to a plane (XY-plane) including these X-direction and Y-direction is defined as Z-direction.

As shown in fig. 1A, a plurality of memory array chips 300 are arranged in a matrix in the X direction and the Y direction, for example, in an area corresponding to 1 mask 100 on a wafer. Similarly, as shown in fig. 1B, a plurality of peripheral circuit chips 200 are arranged in a matrix in the X direction and the Y direction, for example, in an area corresponding to 1 mask 100 on the wafer. The semiconductor memory device of the present embodiment has a structure in which the peripheral circuit chip 200 and the memory array chip 300 are bonded in the Z direction. The peripheral circuit chip 200 and the memory array chip 300 will be described in detail below.

In a semiconductor memory device in which a peripheral circuit chip 200 and a memory array chip 300 are attached and arranged in a matrix, a scribe line 101 is provided between adjacent semiconductor memory devices. In the manufacturing steps thereafter, the plurality of semiconductor memory devices are cut by the dicing lines 101 and separated into the individual semiconductor memory devices 1 shown in fig. 2.

Fig. 2 is a plan view showing the structure of the semiconductor memory device 1 according to embodiment 1. The structure of the semiconductor memory device 1 will be described with reference to fig. 1A, 1B, and 2.

The semiconductor memory device 1 includes memory cell regions 10 and peripheral circuit regions 20. More specifically, the semiconductor memory device 1 is formed by bonding the memory array chip 300 including the memory cell region 10 and the peripheral circuit chip 200 including the peripheral circuit region 20. The memory array chip 300 and the peripheral circuit chip 200 each have, for example, a rectangular shape. The semiconductor memory device 1 formed by bonding the memory array chip 300 and the peripheral circuit chip 200 also has a rectangular shape, for example. As shown in fig. 1A, the memory cell regions 10 are arranged in the Y direction in the memory array chip 300 at or near the center of the rectangular shape, and are surrounded by the end regions 30. As shown in fig. 1B, the peripheral circuit region 20 is arranged in the peripheral circuit chip 200 at or near the center of the rectangular shape in the Y direction, and is surrounded by the end region 30. The memory cell region 10 is a region in which a plurality of memory cells are arranged. The peripheral circuit region 20 is a region in which peripheral circuits for controlling the operations of a plurality of memory cells are provided. The end region 30 is a region disposed so as to surround the memory cell region 10 or the peripheral circuit region 20. The end region 30 is disposed at or near an end periphery in the memory array chip 300 or the peripheral circuit chip 200.

Next, the layout of the memory cell region 10, the peripheral circuit region 20, and the end region 30 in the semiconductor memory device 1 according to embodiment 1, and the pattern provided in the end region 30 will be described with reference to fig. 2.

Fig. 2 shows the arrangement of the conductive layer, the conductive pad, and the via hole as seen from the Z direction in a 1-piece rectangular pattern, and shows a state as seen through the conductive layer and the interlayer insulating layer between the conductive layer and the conductive pad. In fig. 2, the left, right, upper, and lower sides of the rectangular shape of the semiconductor memory device 1 are referred to as a left LS, a right RS, an upper TS, and a lower BS, respectively. Here, the scribe line 101 is shown on the outer periphery of the semiconductor memory device 1, but the scribe line 101 may be removed at the time of dicing. In the following description, "left", "right", "upper", and "lower" correspond to directions in the XY plane.

The chain wiring 31 and the adjacent wirings 32 and 33 are provided in the end region 30. The adjacent wires 32 and 33 are provided adjacent to the chain wire 31. The chain wire 31 is disposed between the adjacent wires 32 and 33. The chain wiring 31 and the adjacent wirings 32 and 33 schematically represent a conductive layer, a conductive pad, and a via hole in 1 rectangular pattern, respectively.

The chain wire 31 is continuously provided so as to surround the memory cell region 10 and the peripheral circuit region 20. The chain wiring 31 includes a1 st portion extending in the Y direction along the left side LS, a2 nd portion extending in the X direction along the upper side TS, a3 rd portion extending in the Y direction along the right side RS, and a4 th portion extending in the X direction along the lower side BS. The chain wire 31 is cut at a certain portion, for example. In the example shown in fig. 2, a part of the link wiring 31 is cut off in the vicinity of the lower left portion of the semiconductor storage device 1, that is, the region where the left LS and the lower BS cross.

The adjacent lines 32 include adjacent lines 32L, 32T, 32R, and 32B arranged in the vicinity of the left LS, upper TS, right RS, and lower BS of the semiconductor memory device 1, respectively. The adjacent lines 32L, 32T, 32R, and 32B are not distinguished from each other, and are referred to as adjacent lines 32. When referred to as adjacent lines 32, they indicate the adjacent lines 32L, 32T, 32R, and 32B, respectively.

The adjacent lines 32L, 32T, 32R, and 32B are disposed on each side (or outer periphery side) of the semiconductor memory device 1 with respect to the chain line 31. The adjacent wiring 32L is arranged at a position corresponding to the left LS, and extends in the Y direction along the left LS. The adjacent wiring 32T is disposed at a position corresponding to the upper side TS, and extends in the X direction along the upper side TS. The adjacent wiring 32R is disposed at a position corresponding to the right RS, and extends in the Y direction along the right RS. The adjacent wiring 32_2 is arranged at a position corresponding to the lower side BS and extends in the X direction along the lower side BS.

The adjacent lines 33 include adjacent lines 33L, 33T, 33R, and 33B arranged in the vicinity of the left LS, upper TS, right RS, and lower BS of the semiconductor memory device 1, respectively. Similarly to the adjacent wiring 32, the adjacent wiring 33L, 33T, 33R, 33B is referred to as the adjacent wiring 33 when no distinction is made therebetween. When the adjacent wiring 33 is described, the adjacent wirings 33L, 33T, 33R, and 33B are shown.

The adjacent wiring 33 is disposed on the center side (or inner peripheral side) of the semiconductor memory device 1 with respect to the chain wiring 31. The adjacent wiring 33L is arranged at a position corresponding to the left LS, and extends in the Y direction along the left LS. The adjacent wiring 33T is arranged at a position corresponding to the upper side TS, and extends in the X direction along the upper side TS. The adjacent wiring 33R is arranged at a position corresponding to the right RS, and extends in the Y direction along the right RS. The adjacent wiring 33_2 is arranged at a position corresponding to the lower side BS and extends in the X direction along the lower side BS.

The dicing line 101 is disposed on the outer periphery of the end region 30 so as to surround the end region 30. Conductive pads 31A, 32A, 33A are provided on the dicing line 101. The conductive pad 31A includes conductive pads 31Aa, 31Ab, 31Ac, 31Ad, 31Ae, 31Af, 31Ag, and 31 Ah. The conductive pads 31Aa to 31Ah are not distinguished from each other, and are referred to as conductive pads 31A. When referred to as the conductive pad 31A, the conductive pads 31Aa to 31Ah are shown.

The conductive pads 32A include conductive pads 32Aa, 32Ab, 32Ac, and 32 Ad. The conductive pads 32Aa to 32Ad are not distinguished from each other, and are referred to as conductive pads 32A. When referred to as conductive pads 32A, the conductive pads 32Aa to 32Ad are shown.

The conductive pad 33A includes conductive pads 33Aa, 33Ab, 33Ac, and 33 Ad. The conductive pads 33Aa to 33Ad are referred to as conductive pads 33A without distinction. When referred to as conductive pads 33A, the conductive pads 33Aa to 33Ad are shown.

The conductive pad 31A is electrically connected to the link wiring 31 provided in the end region 30 via a conductive layer and a via hole (not shown). Similarly, the conductive pads 32A and 33A are electrically connected to the adjacent wires 32 and 33 provided in the end region 30 via the through holes and the conductive layer, respectively.

As described above, the link wiring 31 includes the 1 st section corresponding to the left LS, the 2 nd section corresponding to the upper TS, the 3 rd section corresponding to the right RS, and the 4 th section corresponding to the lower BS.

The conductive pad 31Aa is electrically connected to one end of the 1 st portion of the link wiring 31, and the conductive pad 31Ab is connected to the other end of the 1 st portion. The conductive pad 31Ac is electrically connected to one end of the 2 nd portion of the link wiring 31, and the conductive pad 31Ad is electrically connected to the other end of the 2 nd portion. The conductive pad 31Ae is electrically connected to one end of the 3 rd portion of the link wiring 31, and the conductive pad 31Af is electrically connected to the other end of the 3 rd portion. Further, the conductive pad 31Ag is electrically connected to one end of the 4 th portion of the chain wiring 31, and the conductive pad 31Ah is electrically connected to the other end of the 4 th portion.

The conductive pad 32Aa is electrically connected to the adjacent wiring 32L. The conductive pad 32Ab is electrically connected to the adjacent wiring 32T. The conductive pad 32Ac is electrically connected to the adjacent wiring 32R. Further, the conductive pad 32Ad is electrically connected to the adjacent wiring 32_ 2.

The conductive pad 33Aa is electrically connected to the adjacent wiring 33L. The conductive pad 33Ab is electrically connected to the adjacent wiring 33T. The conductive pad 33Ac is electrically connected to the adjacent wiring 33R. Further, the conductive pad 33Ad is electrically connected to the adjacent wiring 33_ 2.

1.1.2 Circuit configuration of semiconductor memory device

Next, the circuit configuration of the memory cell region 10 and the peripheral circuit region 20 in the semiconductor memory device 1 according to embodiment 1 will be described with reference to fig. 3 to 5.

Fig. 3 is a block diagram showing the circuit configuration of the memory cell region 10 and the peripheral circuit region 20 in the semiconductor memory device according to embodiment 1. The semiconductor memory device 1 includes a memory cell array 11, an input/output circuit 21, a logic control circuit 22, a ready/busy circuit 23, a register group 24, a sequencer (or a control circuit) 25, a voltage generation circuit 26, a driver 27, a row decoder module 28, a column decoder 29, and a sense amplifier module 40. The register group 24 includes a status register 24A, an address register 24B, and a command register 24C.

In the memory cell region 10, a memory cell array 11 is mainly arranged. In the peripheral circuit region 20, an input-output circuit 21, a logic control circuit 22, a ready/busy circuit 23, a register group 24, a sequencer (or a control circuit) 25, a voltage generation circuit 26, a driver 27, a row decoder module 28, a column decoder 29, and a sense amplifier module 40 are mainly arranged.

The memory cell array 11 includes 1 or more blocks BLK0, BLK1, BLK2, …, and BLKm (m is an integer of 0 or more). The blocks BLK respectively include a plurality of memory cell transistors corresponding to the rows and columns. The memory cell transistor is a nonvolatile memory cell capable of being electrically rewritten. In order to control the voltage applied to the memory cell transistor, a plurality of word lines, a plurality of bit lines, a source line, and the like are arranged in the memory cell array 11. Hereinafter, when referred to as a block BLK, the blocks BLK0 to BLKm are shown. The specific configuration of the block BLK will be described below.

The input/output circuit 21 and the logic control circuit 22 are connected to an external device (not shown) such as a memory controller via a bus. Signals DQ (e.g., DQ0, DQ1, DQ2, …, DQ7) are transmitted and received between the input-output circuit 21 and the memory controller via a bus.

The logic control circuit 22 receives external control signals from the memory controller via a bus. The external control signals include, for example, a chip enable signal CEn, a command latch enable signal CLE, an address latch enable signal ALE, a write enable signal WEn, a read enable signal REn, and a write protect signal WPn. The "n" labeled in the signal name indicates that its signal is active low.

The chip enable signal CEn enables the semiconductor storage device (NAND-type flash memory) 1 to be selected and is asserted when the semiconductor storage device 1 is selected. The command latch enable signal CLE can latch a command transmitted in the form of the signal DQ in the command register 24C. The address latch enable signal ALE can latch an address transmitted in the form of the signal DQ in the address register 24B. The write enable signal WEn can store data transmitted in the form of the signal DQ in the input-output circuit 21. The read enable signal REn can output data read from the memory cell array 11 in the form of a signal DQ. The write protect signal WPn is asserted when writing and erasing to the semiconductor memory device 1 are prohibited.

The ready/busy circuit 23 generates a ready/busy signal R/Bn according to control from the sequencer 25. The signal R/Bn indicates whether the semiconductor memory apparatus 1 is in a ready state or in a busy state. The ready state indicates a state in which a command from the memory controller can be received. The busy state indicates a state in which a command from the memory controller cannot be accepted. The memory controller can recognize whether the semiconductor memory device 1 is in a ready state or a busy state by receiving the signal R/Bn from the semiconductor memory device 1.

The status register 24A stores status information STS necessary for the operation of the semiconductor memory device 1, and transmits the status information STS to the input/output circuit 21 in response to an instruction from the sequencer 25. The address register 24B holds address information ADD transferred from the input-output circuit 21. The address information ADD includes a column address and a row address. The row address includes, for example, a block address specifying a block BLK to be operated, and a page address specifying a word line to be operated in the specified block. The command register 24C holds the command CMD transmitted from the input-output circuit 21. The command CMD includes, for example, a write command for commanding a write operation to the sequencer 25, a read command for commanding a read operation, and the like. The status register 24A, the address register 24B, and the command register 24C are formed of, for example, an SRAM (static random access memory).

The sequencer 25 receives a command from the command register 24C, and collectively controls the semiconductor memory apparatus 1 in an order based on the command. The sequencer 25 controls the row decoder block 28, the sense amplifier block 40, the voltage generation circuit 26, and the like, and executes a write operation, a read operation, and an erase operation.

Specifically, the sequencer 25 controls the row decoder module 28, the driver 27, and the sense amplifier module 40 based on the write command received from the command register 24C, writing data to the plurality of memory cell transistors specified by the address information ADD. Further, the sequencer 25 controls the row decoder block 28, the driver 27, and the sense amplifier block 40 based on the read command received from the command register 24C, and reads data from the plurality of memory cell transistors specified by the address information ADD.

The voltage generation circuit 26 receives a power supply voltage from the outside of the semiconductor memory device 1, and generates a plurality of voltages necessary for a write operation, a read operation, and an erase operation using the power supply voltage. The voltage generation circuit 26 supplies the generated voltage to the memory cell array 11, the driver 27, the sense amplifier module 40, and the like.

The driver 27 receives a plurality of voltages from the voltage generation circuit 26. The driver 27 supplies, to the row decoder block 28, a plurality of voltages selected in accordance with the read operation, the write operation, and the erase operation, among the plurality of voltages supplied from the voltage generation circuit 26, via a plurality of signal lines.

Row decoder module 28 receives a row address from address register 24B and decodes the row address. The row decoder module 28 selects any one of the blocks BLK based on the decoding result of the row address, thereby selecting a word line within the selected block BLK. In turn, the row decoder block 28 transfers a plurality of voltages supplied from the driver 27 to the selected block BLK.

The column decoder 29 receives a column address from the address register 24B and decodes the column address. The column decoder 29 selects a bit line based on the decoding result of the column address.

The sense amplifier module 40 detects and amplifies data read from the memory cell transistor to the bit line during a data read operation. Also, the sense amplifier module 40 temporarily holds the readout data DAT read out from the memory cell transistors, and transmits the readout data DAT to the input-output circuit 21. In addition, the sense amplifier module 40 temporarily holds the write data DAT transmitted from the input/output circuit 21 during a data write operation. In turn, the sense amplifier module 40 transmits the write data DAT to the bit lines.

Next, a circuit configuration of the memory cell array 11 will be described with reference to fig. 4. As described above, the memory cell array 11 includes a plurality of blocks BLK0 to BLKm. Here, the circuit configuration of 1 block BLK will be described, and the circuit configurations of other blocks are also the same.

Fig. 4 is a circuit diagram of 1 block BLK within the memory cell array 11. The block BLK includes, for example, a plurality of string units SU0, SU1, SU2, and SU 3. Here, an example in which the block BLK includes the string units SU0 to SU3 is shown as an example, but the number of string units included in the block BLK may be set arbitrarily. Hereinafter, the description of the string units SU refers to the string units SU0 to SU 3.

Each of the string units SU0 to SU3 includes a plurality of NAND strings (or memory strings) NS. The number of NAND strings NS included in the 1 string unit SU can be arbitrarily set.

The NAND string NS includes a plurality of memory cell transistors MT0, MT1, MT2, …, MT7, and select transistors ST1, ST 2. Here, for the sake of easy explanation, an example is shown in which the NAND string NS includes 8 memory cell transistors MT0 to MT7 and 2 selection transistors ST1 and ST2, but the number of memory cell transistors and selection transistors included in the NAND string NS can be set arbitrarily. Hereinafter, the memory cell transistors MT are referred to as memory cell transistors MT0 to MT 7.

The memory cell transistors MT0 to MT7 each include a control gate and a charge storage layer, and store data in a nonvolatile manner. The memory cell transistors MT0 to MT7 are connected in series between the source of the selection transistor ST1 and the drain of the selection transistor ST 2.

The memory cell transistor MT can store 1 bit of data or 2 bits or more of data. The memory cell transistor MT may be a MONOS (metal oxide nitride oxide silicon) type using an insulating film as a charge storage layer, or an FG (floating gate) type using a conductive layer as a charge storage layer.

The gates of a plurality of select transistors ST1 included in the string unit SU0 are connected to the select gate line SGD 0. Similarly, the gates of the select transistors ST1 of the string units SU1 to SU3 are connected to the select gate lines SGD1 to SGD3, respectively. The select gate lines SGD 0-SGD 3 are independently controlled by row decoder block 28, respectively.

The gates of a plurality of select transistors ST2 included in the string unit SU0 are connected to the select gate line SGS. Similarly, the gates of the select transistors ST2 of the string units SU1 to SU3 are connected to the select gate line SGS. In addition, the individual select gate lines SGS, i.e., the select gate lines SGS0 to SGS3 may be connected to the string units SU0 to SU3 included in the block BLK, respectively. The selection transistors ST1 and ST2 are used for selecting the string unit SU in various operations.

The control gates of the memory cell transistors MT 0-MT 7 included in the block BLK are connected to word lines WL 0-WL 7, respectively. Word lines WL 0-WL 7 are each independently controlled by row decoder module 28.

Bit lines BL0 to BLi (i is an integer equal to or greater than 0) are connected to the plurality of blocks BLK and to 1 NAND string NS in the string unit SU included in the block BLK, respectively. That is, the bit lines BL0 to BLi are connected to the drains of the select transistors ST1 of a plurality of NAND strings NS located in the same column among the NAND strings NS arranged in a matrix in the block BLK. In addition, the source lines SL are connected to the blocks BLK. That is, the source line SL is connected to the sources of the plurality of selection transistors ST2 included in the block BLK.

In summary, the string unit SU includes a plurality of NAND strings NS connected to different bit lines BL and connected to the same select gate line SGD. In addition, the block BLK includes a plurality of string units SU common to the word lines WL. Further, the memory cell array 11 includes a plurality of blocks BLK common to the bit lines BL.

The block BLK is, for example, a deletion unit of data. That is, the data held by the memory cell transistors MT included in the same block BLK is erased at a time. The data may be deleted in units of the string unit SU, or may be deleted in units of the string unit SU.

The plurality of memory cell transistors MT sharing the word line WL in 1 string unit SU is referred to as a cell unit CU. A set of 1-bit data stored in each of the plurality of memory cell transistors MT included in the cell unit CU is referred to as a page. The storage capacity of the cell unit CU varies according to the number of bits of data stored in the memory cell transistor MT. For example, the cell unit CU stores 1 page of data in the case where each memory cell transistor MT stores 1 bit of data, 2 pages of data in the case where 2 bits of data are stored, and 3 pages of data in the case where 3 bits of data are stored.

The write operation and the read operation to the unit cell CU are performed in units of pages. In other words, the read and write operations are performed at one time for a plurality of memory cell transistors MT connected to 1 word line WL provided in 1 string unit SU.

The memory cell array 11 may have another configuration. The structure of the MEMORY cell array 11 is described in, for example, U.S. patent application No. 12/407,403, entitled "THREE-DIMENSIONAL STACKED non-volatile SEMICONDUCTOR MEMORY (THREE-DIMENSIONAL STACKED non-volatile SEMICONDUCTOR MEMORY)" filed on 3/19 of 2009. Further, us patent application No. 12/406,524 filed on 3/18/2009 entitled "THREE-DIMENSIONAL STACKED NON-VOLATILE SEMICONDUCTOR MEMORY (THREE-DIMENSIONAL STACKED NON-VOLATILE SEMICONDUCTOR MEMORY"), us patent application No. 12/679,991 filed on 25/2010 entitled "NON-VOLATILE SEMICONDUCTOR MEMORY device AND METHOD FOR MANUFACTURING THE SAME (NON-VOLATILE SEMICONDUCTOR MEMORY device STORAGE DEVICE AND METHOD OF managing THE SAME)," AND us patent application No. 12/532,030 filed on 23/2009/23 entitled "SEMICONDUCTOR MEMORY AND METHOD FOR MANUFACTURING THE SAME" (SEMICONDUCTOR MEMORY device AND METHOD FOR MANUFACTURING THE SAME) ". These patent applications are incorporated in their entirety by reference into the present specification.

Next, a cross-sectional structure of the NAND string NS in the memory cell array 11 will be described with reference to fig. 5. As described above, the NAND string NS includes the memory cell transistors MT0 to MT7, and the select transistors ST1, ST 2.

Fig. 5 is a cross-sectional view of the NAND string NS in the memory cell array 11 in embodiment 1. In addition, an interlayer insulating film between the conductive layers is omitted in fig. 5.

As shown in FIG. 5, the memory cell array 11 includes a semiconductor substrate 50, conductive layers 51 to 54, memory pillars MP, and contact plugs CP 1. A conductive layer 51 is provided over the semiconductor substrate 50. The conductive layer 51 is formed in a flat plate shape parallel to the XY plane, and functions as a source line SL. In addition, the main surface of the semiconductor substrate 50 corresponds to the XY plane.

On the conductive layer 51, a plurality of slits SLT along the XZ plane are arranged in the Y direction. The structure (or laminate) between adjacent slits SLT on the conductive layer 51 corresponds to, for example, 1 string unit SU.

On the conductive layer 51 and between the adjacent slits SLT, a conductive layer 52, a plurality of conductive layers 53, a conductive layer 54, and a conductive layer 55 are provided in this order from the lower layer. Of these conductive layers, those adjacent in the Z direction are laminated with an interlayer insulating film interposed therebetween. The conductive layers 52 to 54 are formed in a flat plate shape parallel to the XY-plane. The conductive layer 52 functions as a select gate line SGS. The conductive layers 53 function as word lines WL0 to WL7 in this order from the bottom. The conductive layer 54 functions as a select gate line SGD. The conductive layers 52 to 54 contain tungsten (W), for example.

The plurality of memory pillars MP are arranged in a staggered manner in the X direction and the Y direction, for example. The plurality of memory pillars MP extend (or penetrate) in the Z direction in the layered body between the slits SLT, respectively. Each memory pillar MP is provided through the conductive layers 54, 53, and 52 so as to reach the upper surface of the conductive layer 51 from the upper surface of the conductive layer 54. Each memory pillar MP functions as 1 NAND string NS.

The memory pillar MP has, for example, a block insulating layer 60, a charge storage layer 61, a tunnel insulating layer (also referred to as a tunnel insulating film) 62, and a semiconductor layer 63. Specifically, the blocking insulating layer 60 is disposed on the inner wall of the storage hole for forming the storage pillar MP. A charge storage layer 61 is provided on the inner wall of the blocking insulating layer 60. A tunnel insulating layer 62 is provided on the inner wall of the charge storage layer 61. Further, a semiconductor layer 63 is provided inside the tunnel insulating layer 62. The memory column MP may have a structure in which a core insulating layer is provided inside the semiconductor layer 63.

In the structure of the memory pillar MP, a portion where the memory pillar MP and the conductive layer 52 intersect functions as the selection transistor ST 2. The portions where the memory pillars MP and the conductive layer 53 intersect each other function as memory cell transistors MT0 to MT 7. Further, a portion where the memory pillar MP and the conductive layer 54 intersect functions as a selection transistor ST 1.

The semiconductor layer 63 functions as a channel layer for the memory cell transistor MT and the selection transistors ST1 and ST 2. A current path of the NAND string NS is formed inside the semiconductor layer 63.

The charge storage layer 61 has a function of storing charges injected from the semiconductor layer 63 in the memory cell transistor MT. The charge storage layer 61 includes, for example, a silicon nitride film.

The tunnel insulating layer 62 functions as a potential barrier when charges are injected from the semiconductor layer 63 into the charge storage layer 61 or when charges stored in the charge storage layer 61 diffuse into the semiconductor layer 63. The tunnel insulating layer 62 includes, for example, a silicon oxide film.

The blocking insulating layer 60 prevents charges stored in the charge storage layer 61 from diffusing to the conductive layer 53 (word line WL). The blocking insulating layer 60 includes, for example, a silicon oxide layer and a silicon nitride layer.

The conductive layer 55 is provided above the upper surface of the memory pillar MP via an interlayer insulating film. The conductive layer 55 is a linear wiring layer extending in the Y direction and functions as a bit line BL. A plurality of conductive layers 55 are arranged in the X direction, and the conductive layers 55 are electrically connected to 1 memory column MP corresponding to each string unit SU. Specifically, in each string unit SU, contact plug CP1 is provided on semiconductor layer 63 in each memory column MP, and 1 conductive layer 55 is provided on contact plug CP 1. The conductive layer 55 contains, for example, aluminum (Al), tungsten (W), or copper (Cu). The contact plug CP1 includes a conductive layer, for example, tungsten (W).

The number of word lines WL and the number of select gate lines SGD and SGS are not limited to the above number, and may be changed depending on the number of memory cell transistors MT and the number of select transistors ST1 and ST 2. The selection gate line SGS may be formed of a plurality of conductive layers provided in a plurality of layers, respectively. The selection gate line SGD may be formed of a plurality of conductive layers provided in a plurality of layers, respectively.

1.1.3 Cross-sectional Structure of semiconductor memory device

Next, the cross-sectional structure of the semiconductor memory device 1 will be described with reference to fig. 6 to 11. In fig. 6 to 11, the interlayer insulating film between the conductive layers is omitted. In the cross-sectional views shown in fig. 6 to 11, the direction of the arrow in the Z direction is referred to as a positive direction, and the direction opposite to the direction of the arrow in the Z direction is referred to as a negative direction.

Fig. 6 is a cross-sectional view taken along the line a1-a1 in fig. 2, and is a cross-sectional view taken along the XZ plane of the memory cell region 10, the peripheral circuit region 20, and the end region 30. FIG. 7 is a cross-sectional view taken along line A2-A2 at a different location than line A1-A1 in FIG. 2.

The semiconductor memory device 1 includes a peripheral circuit chip 200 and a memory array chip 300. The peripheral circuit chip 200 includes a semiconductor substrate 70 and a peripheral circuit provided on the semiconductor substrate 70. The memory array chip 300 includes a semiconductor substrate 50, and a memory cell array disposed on the semiconductor substrate 50.

The peripheral circuit chip 200 and the memory array chip 300 are attached to each other with the conductive pads facing each other through the conductive pads disposed on the respective surfaces. That is, the semiconductor memory device 1 has a structure in which the conductive pads on the upper surface of the peripheral circuit chip 200 and the conductive pads on the upper surface of the memory array chip 300 are bonded to each other.

As shown in fig. 6, memory pillars MP, conductive layers 51, 52, 53, and 54, and the like are arranged in the memory cell region 10 of the memory array chip 300. In addition, a CMOS (complementary metal oxide semiconductor) circuit CM as a peripheral circuit is disposed in the peripheral circuit region 20 of the peripheral circuit chip 200. That is, the memory cell region 10 of the memory array chip 300 and the peripheral circuit region 20 of the peripheral circuit chip 200 are arranged so as to overlap when viewed from the Z direction.

Further, depending on the size of a transistor forming a peripheral circuit or the like, the following regions may be present: only the CMOS circuit CM is disposed without disposing the memory column MP when viewed from the Z direction. This is shown in fig. 7.

The chain wiring 31 and the adjacent wirings 32 and 33 are disposed in the end region 30 of the memory array chip 300 and the peripheral circuit chip 200.

Hereinafter, a cross-sectional structure of the memory cell region 10 in the memory array chip 300 will be described in detail with reference to fig. 6.

A conductive layer 51 is provided on a semiconductor substrate 50 in a negative direction of a Z direction via an insulating layer. A laminate in which a conductive layer 52, a plurality of conductive layers 53, and a conductive layer 54 are laminated in a negative direction of the Z direction with an insulating layer interposed therebetween is provided on the conductive layer 51. The conductive layers 51 to 54 have a plate shape along (or parallel to) the XY-plane (or the surface of the semiconductor substrate 50). The conductive layers 51 to 54 extend in the X direction.

The conductive layer 51 functions as a source line SL. The conductive layer 52 functions as a select gate line SGS. The conductive layer 53 functions as a plurality of word lines WL0 to WL 7. The conductive layer 54 functions as a select gate line SGD. The conductive layers 51 to 54 contain, for example, tungsten (W) or polysilicon. The semiconductor substrate 50 includes, for example, a silicon substrate and an epitaxial layer of silicon.

The conductive layers 52 to 54 extending in the X direction are electrically connected to the conductive layer 56A via contact plugs CP 2. In fig. 6, only a part of the contact plug CP2 connected to the conductive layer 53 is shown, and the contact plugs connected to the other conductive layers 52 and 54 are omitted. In the conductive layer 56A, a via hole 57A, a conductive pad 58A, a via hole 59A, and a conductive pad 60A are provided in this order in the negative direction of the Z direction.

A plurality of memory pillars MP of a columnar body are provided on a laminate body including conductive layers 52 to 54. Each of the storage pillars MP extends in the Z direction. Each memory pillar MP is arranged to penetrate the conductive layers 52 to 54 in the Z direction (or lamination direction), and reaches the conductive layer 51 from the surface of the conductive layer 54. That is, the memory pillars MP are connected to the source lines SL via the select gate line SGD, the plurality of word lines WL0 to WL7, and the select gate line SGS.

At the storage pillar MP, a contact plug CP1 is disposed in a negative direction of the Z direction, and a conductive layer 55 (or a bit line BL) is disposed at the contact plug CP 1. In the conductive layer 55, the via hole 59B, and the conductive pad 60B are provided in this order in the negative direction of the Z direction. The details of the memory column MP are as described above with reference to fig. 5.

In the semiconductor substrate 50, the contact plug CP3 is disposed in the negative direction of the Z direction, and the conductive pad 56C is disposed at the contact plug CP 3. Further, in the conductive pad 56C, a through hole 57C, a conductive pad 58C, a through hole 59C, and a conductive pad 60C are provided in this order in the negative direction of the Z direction.

Hereinafter, a cross-sectional structure of the peripheral circuit region in the peripheral circuit chip 200 will be described in detail with reference to fig. 6.

The semiconductor substrate 70 is provided with a CMOS circuit CM including, for example, an n-channel MOS (metal oxide semiconductor) field effect transistor (hereinafter, referred to as an nMOS transistor) and a p-channel MOS field effect transistor (hereinafter, referred to as a pMOS transistor). The CMOS circuit CM constitutes a peripheral circuit that controls the operation of the plurality of memory cells. The semiconductor substrate 70 includes, for example, a silicon substrate and an epitaxial layer of silicon.

As shown in fig. 6, a source region and a drain region 70A and an element isolation region 70B are provided in a semiconductor substrate 70. In the semiconductor substrate 70 between the source region 70A and the drain region 70A, a gate insulating layer 71 is provided in the positive direction of the Z direction, and a gate electrode 72 is provided on the gate insulating layer 71. The nMOS transistor and the pMOS transistor include a source region 70A, a drain region 70A, a semiconductor layer of the semiconductor substrate 70, a gate insulating layer 71, and a gate electrode 72, respectively.

In the source region 70A and the drain region 70A, through holes 73A are provided in the positive direction of the Z direction, and conductive layers 74A are provided in the through holes 73A. The conductive layer 74A, the via hole 75A, the conductive layer 76A, the via hole 77A, the conductive layer 78A, the via hole 79A, the conductive layer 80A, the via hole 81A, and the conductive pad 82A are provided in this order in the positive direction of the Z direction. The conductive pad 82A is disposed on the surface of the peripheral circuit chip 200 in the positive Z-direction.

In the other source region 70A and the drain region 70A, through holes 73B are provided in the positive direction of the Z direction, respectively, and conductive layers 74B are provided in the through holes 73B, respectively. In the conductive layer 74B, the through hole 75B, the conductive layer 76B, the through hole 77B, the conductive layer 78B, the through hole 79B, the conductive layer 80B, the through hole 81B, and the conductive pad 82B are provided in this order in the positive direction of the Z direction. The conductive pad 82B is disposed on the surface of the peripheral circuit chip 200 in the positive Z-direction.

In the impurity diffusion region 70C of the semiconductor substrate 70, a through hole 73C is provided in the positive direction of the Z direction, and a conductive layer 74C is provided in the through hole 73C. Further, in the conductive layer 74C, a through hole 75C, a conductive layer 76C, a through hole 77C, a conductive layer 78C, a through hole 79C, a conductive layer 80C, a through hole 81C, and a conductive pad 82C are provided in this order in the positive direction of the Z direction. The conductive pad 82C is disposed on the surface of the peripheral circuit chip 200 in the positive Z-direction.

The conductive pads 82A and 60A, the conductive pads 82B and 60B, and the conductive pads 82C and 60C of the peripheral circuit chip 200 and the memory array chip 300 are respectively attached in an opposing manner. Thereby, the conductive pad 82A is joined and electrically connected to the conductive pad 60A. Similarly, the conductive pad 82B and the conductive pad 60B, and the conductive pad 82C and the conductive pad 60C are respectively bonded and electrically connected.

Next, the cross-sectional structures of the end regions 30 in the peripheral circuit chip 200 and the memory array chip 300 will be described in detail with reference to fig. 6, 8, and 9.

Fig. 8 is a sectional view taken along the line A3-A3 in fig. 2, and is a sectional view taken along the XZ plane of the chain wiring 31 in the end region 30. Fig. 9 is a sectional view taken along the line a4-a4 in fig. 2, and is a sectional view taken along the XZ plane of the adjacent wiring 32 of the end region 30.

As described above, the chain wire 31 and the adjacent wires 32 and 33 arranged adjacent to the chain wire 31 with the chain wire 31 interposed therebetween are provided in the end region 30.

The cross-sectional structure of the chain wiring 31 will be described below.

As shown in fig. 6 and 8, the link wiring 31 includes a conductive layer 311, a via hole 312, and a conductive pad 313 in the peripheral circuit chip 200, and includes a conductive layer 314, a via hole 315, a conductive layer 316, a via hole 317, and a conductive pad 318 in the memory array chip 300. The conductive layers, the through holes, and the conductive pads are electrically connected to form a chain wiring 31.

A conductive pad 313 is disposed on the upper surface of the peripheral circuit chip 200. Specifically, the conductive pads 313 are provided on the side of the peripheral circuit chip 200 on the bonding surface of the peripheral circuit chip 200 and the memory array chip 300. In the conductive pad 313, the via hole 312, and the conductive layer 311 are arranged in this order in the negative direction of the Z direction (or the semiconductor substrate 70 side).

Further, a conductive layer 90 is provided on the semiconductor substrate 70 via an insulating layer in the positive Z direction. The conductive layer 90 functions as a crack barrier layer for preventing cracks generated from the dicing line. Further, the conductive layer 90 functions as a barrier layer for preventing contaminants from entering from the side surface of the semiconductor memory device 1.

Conductive pads 318 are provided on the upper surface of the memory array chip 300. Specifically, the conductive pads 318 are disposed on the memory array chip 300 side of the bonding surface of the peripheral circuit chip 200 and the memory array chip 300. At the conductive pad 318, the via 317, and the conductive layer 316, the via 315, and the conductive layer 314 are sequentially provided in the positive direction (or the semiconductor substrate 50 side) in the Z direction. In the conductive layer 314, a contact plug CP41 is provided in the positive direction of the Z direction.

Contact plug CP41 passes through semiconductor substrate 50 to reach the surface of semiconductor substrate 50. The conductive pad 31A is provided on the contact plug CP41 on the surface of the semiconductor substrate 50. The conductive pad 31A is electrically connected to the contact plug CP 41. With this structure, the conductive pad 31A is electrically connected to the contact plug CP41, the conductive layer 314, the via 315, the conductive layer 316, the via 317, and the conductive pad 318.

The cross-sectional structure of the adjacent wiring 32 will be described below.

As shown in fig. 6 and 9, the adjacent wire 32 has a conductive layer 321, a via hole 322, and a conductive pad 323 in the peripheral circuit chip 200, and has a conductive layer 324, a via hole 325, a conductive layer 326, a via hole 327, and a conductive pad 328 in the memory array chip 300. These conductive layers, through holes, and conductive pads are electrically connected to form adjacent wirings 32.

A conductive pad 323 is provided on the upper surface of the peripheral circuit chip 200. Specifically, the conductive pad 323 is provided on the bonding surface of the peripheral circuit chip 200 and the memory array chip 300 on the side of the peripheral circuit chip 200. In the conductive pad 323, the via hole 322, and the conductive layer 321 are provided in this order in the negative direction of the Z direction (or the semiconductor substrate 70 side). Further, a conductive layer 90 is provided on the semiconductor substrate 70 via an insulating layer in the positive Z direction.

Conductive pads 328 are provided on the upper surface of the memory array chip 300. In detail, the conductive pads 328 are disposed on the memory array chip 300 side of the bonding surface of the peripheral circuit chip 200 and the memory array chip 300. At the conductive pad 328, the via 327, and the conductive layer 326, the via 325, and the conductive layer 324 are sequentially provided in the positive direction in the Z direction (or the semiconductor substrate 50 side). In the conductive layer 324, a contact plug CP42 is provided in the positive direction of the Z direction.

Contact plug CP42 passes through semiconductor substrate 50 to reach the surface of semiconductor substrate 50. The conductive pad 32A is provided on the contact plug CP42 on the surface of the semiconductor substrate 50. The conductive pad 32A is electrically connected to the contact plug CP 42. With this structure, the conductive pad 32A is electrically connected to the contact plug CP42, the conductive layer 324, the via 325, the conductive layer 326, the via 327, and the conductive pad 328.

The cross-sectional structure of the adjacent wiring 33 will be described below. The adjacent wiring 33 is disposed on the opposite side of the chain wiring 31 from the portion where the adjacent wiring 32 is disposed, unlike the portion where the adjacent wiring 32 is disposed. The cross-sectional structure of the adjacent wiring 33 is substantially the same as that of the adjacent wiring 32, and therefore, a cross-sectional view along the XZ plane is omitted.

As shown in fig. 6, the adjacent wiring 33 has a conductive layer 331, a via hole 332, and a conductive pad 333 in the peripheral circuit chip 200, and has a conductive layer 334, a via hole 335, a conductive layer 336, a via hole 337, and a conductive pad 338 in the memory array chip 300. These conductive layers, through holes, and conductive pads are electrically connected to form adjacent wirings 33.

Conductive pads 333 are provided on the upper surface of the peripheral circuit chip 200. Specifically, the conductive pads 333 are provided on the bonding surface of the peripheral circuit chip 200 and the memory array chip 300 on the side of the peripheral circuit chip 200. In the conductive pad 333, the via hole 332, and the conductive layer 331 are provided in this order in the negative direction of the Z direction (or the semiconductor substrate 70 side). Further, a conductive layer 90 is provided on the semiconductor substrate 70 via an insulating layer in the positive Z direction.

Conductive pads 338 are provided on the upper surface of the memory array chip 300. In detail, the conductive pads 338 are disposed on the memory array chip 300 side of the bonding surface of the peripheral circuit chip 200 and the memory array chip 300. At conductive pad 338, via 337, and conductive layer 336, via 335, and conductive layer 334 are sequentially provided in the positive direction of the Z direction (or semiconductor substrate 50 side). In the conductive layer 334, a contact plug CP43 is provided in the positive direction of the Z direction.

Contact plug CP43 passes through semiconductor substrate 50 to reach the surface of semiconductor substrate 50. The conductive pad 33A is provided on the contact plug CP43 on the surface of the semiconductor substrate 50. The conductive pad 33A is electrically connected to the contact plug CP 43. With this structure, conductive pad 33A is electrically connected to contact plug CP43, conductive layer 334, via 335, conductive layer 336, via 337, and conductive pad 338.

The conductive pads 313 and 318, the conductive pads 323 and 328, and the conductive pads 333 and 338 of the peripheral circuit chip 200 and the memory array chip 300 are respectively attached in an opposing manner. Thereby, the conductive pad 313 is joined and electrically connected to the conductive pad 318. Similarly, the conductive pads 323 and 328, and 333 and 338 are bonded and electrically connected, respectively.

In addition, fig. 6 shows an example in which the peripheral circuit is provided so as to overlap with the memory pillars and the like of the memory cell region 10 when viewed from the Z direction, but the present invention is not limited to this. In the semiconductor memory device 1, there may be a portion where a peripheral circuit is not provided so as to overlap with a memory pillar or the like of the memory cell region 10 when viewed from the Z direction. This is shown in fig. 10. Further, for example, depending on the layout of each element in the memory cell region 10 and the peripheral circuit region 20, there may be a portion where neither the memory cell array nor the peripheral circuit is provided. This is shown in fig. 11.

1.1.4 details of the end regions in semiconductor memory devices

Next, the chain wiring 31 and the adjacent wirings 32 and 33 in the end region 30 will be described in detail with reference to fig. 12 to 16. In fig. 12 to 16, through holes 315, 325, and 335, conductive layers 314, 324, and 334, and contact plugs CP41, CP42, and CP43 are omitted.

Fig. 12 is a plan view schematically showing a chain wiring 31 and adjacent wirings 32 and 33 provided in an end region 30 of the semiconductor memory device 1. Fig. 12 shows the chain wiring 31 and the adjacent wirings 32 and 33 along the upper TS among the left LS, the right RS, the upper TS, and the lower BS. The conductive pads for measurement of the respective chain wirings 31 and adjacent wirings 32 and 33 along the left LS, right RS, and lower BS are different, and other configurations are the same as those shown in fig. 12 to 16.

Fig. 13 is a sectional view taken along the line B1-B1 (or chain wiring) in fig. 12, and fig. 14 is a sectional view taken along the line B2-B2 (or adjacent wiring) in fig. 12. Fig. 15 is a sectional view taken along line B3-B3 (or adjacent wiring) in fig. 12. Further, FIG. 16 is a sectional view taken along line B4-B4 in FIG. 12.

As shown in fig. 12, a chain wire 31 and adjacent wires 32 and 33 are provided in the end region 30. The chain wire 31 is disposed adjacent to the adjacent wires 32 and 33. The chain wire 31 is disposed between the adjacent wires 32 and 33.

As shown in fig. 12, 13, and 16, the link wiring 31 has a conductive pad 313, a via 312, and a conductive layer 311 in the peripheral circuit chip 200, and a conductive pad 318, a via 317, and a conductive layer 316 in the memory array chip 300.

As shown in fig. 13, in the peripheral circuit chip 200, the conductive layer 311 extends in the X direction. The plurality of conductive pads 313 are arranged in the X direction at a designated interval. The conductive pad 313 is electrically connected to one end of the conductive layer 311 through the via 312. Another conductive pad 313 is electrically connected to the other end of the conductive layer 311 through the via 312.

Within memory array chip 300, conductive layer 316 extends in the X-direction. A plurality of conductive pads 318 are arranged at a designated interval in the X direction. The conductive pad 318 is electrically connected to one end of the conductive layer 316 through the via 317. Another conductive pad 318 is electrically connected to the other end of conductive layer 316 through via 317.

The conductive pad 313 is disposed on the upper surface of the peripheral circuit chip 200. The conductive pad 318 is disposed on the upper surface of the memory array chip 300. The conductive pad 313 and the conductive pad 318 are disposed at positions corresponding to each other in the Z direction. The conductive pad 313 and the conductive pad 318 are attached in an opposite manner.

Conductive pad 31Ac is electrically connected to one end of conductive layer 316 through via 315, conductive layer 314, and contact plug CP41 (not shown). The conductive pad 31Ad is electrically connected to one end of another conductive layer 316 through the via 315, the conductive layer 314, and the contact plug CP 41.

With this structure, the conductive pad 31Ac and the conductive pad 31Ad are electrically connected through the conductive layer 316, the via 317, the conductive pad 318, the conductive pad 313, the via 312, and the conductive layer 311. The conductive pads 313 and 318 may be regularly arranged at a predetermined interval in the X direction, or may be arranged at an arbitrary interval in design.

As shown in fig. 12, 14, and 16, the adjacent wiring 32 includes a conductive pad 323, a via 322, and a conductive layer 321 in the peripheral circuit chip 200, and a conductive pad 328, a via 327, and a conductive layer 326 in the memory array chip 300.

As shown in fig. 14, in the peripheral circuit chip 200, the conductive layer 321 extends in the X direction. A plurality of conductive pads 323 are arranged in the X direction at designated intervals. Each conductive pad 323 is electrically connected to the conductive layer 321 through the via 322. Within memory array chip 300, conductive layer 326 extends in the X-direction. The plurality of conductive pads 328 are arranged at a designated interval in the X direction. Each conductive pad 328 is electrically connected to the conductive layer 326 through a via 327.

The conductive pad 323 is disposed on the upper surface of the peripheral circuit chip 200. Conductive pads 328 are disposed on the upper surface of the memory array chip 300. The conductive pads 323 and 328 are disposed at positions corresponding to each other in the Z direction. The conductive pad 323 and the conductive pad 328 are attached in a manner that the conductive pad 323 and the conductive pad 328 are opposite to each other.

The conductive pads 313, 318, 323, 328, 333, and 338 are respectively formed, for example, in the same size as viewed from the Z direction, and have a rectangular shape. The dimension Y1 in the Y direction of each conductive pad is larger than the interval Y2 between adjacent conductive pads in the Y direction.

Conductive pad 32Ab is electrically connected to conductive layer 326 through via 325, conductive layer 324, and contact plug CP42 (not shown).

With this structure, the conductive pad 32Ab is electrically connected to the conductive layer 326, the via 327, the conductive pad 328, the conductive pad 323, the via 322, and the conductive layer 321. The conductive pads 323 and 328 may be regularly arranged at a predetermined interval in the X direction, or may be arranged at an arbitrary interval in design.

The adjacent wiring 33 has substantially the same structure as the adjacent wiring 32. As shown in fig. 12 and 15, the adjacent wiring 33 includes a conductive pad 333, a via 332, and a conductive layer 331 in the peripheral circuit chip 200, and a conductive pad 338, a via 337, and a conductive layer 336 in the memory array chip 300.

In the peripheral circuit chip 200, the conductive layer 331 extends in the X direction. The plurality of conductive pads 333 are arranged in the X direction at a designated interval. Each conductive pad 333 is electrically connected to the conductive layer 331 through the via 332. Within memory array chip 300, conductive layer 336 extends in the X-direction. The plurality of conductive pads 338 are arranged at a designated interval in the X direction. Each conductive pad 338 is electrically connected to conductive layer 336 through via 337.

The conductive pad 333 is provided on the upper surface of the peripheral circuit chip 200. Conductive pads 338 are disposed on the upper surface of the memory array chip 300. The conductive pads 333 and 338 are disposed at positions corresponding to each other in the Z direction. The conductive pads 333 and 338 are attached in an opposing manner.

Conductive pad 33Ab is electrically connected to conductive layer 336 through via 335, conductive layer 334, and contact plug CP43 (not shown).

With this structure, conductive pad 33Ab is electrically connected to conductive layer 336, via 337, conductive pad 338, conductive pad 333, via 332, and conductive layer 331. The conductive pads 333 and 338 may be regularly arranged at a predetermined interval in the X direction, or may be arranged at an arbitrary interval in design.

1.2 actions of embodiment 1

In embodiment 1, the bonding state (or electrical connection state) of the conductive pad 313 of the peripheral circuit chip 200 and the conductive pad 318 of the memory array chip 300 by bonding is detected using the link wiring 31. That is, it is detected whether or not a connection failure such as peeling occurs between the conductive pads of the peripheral circuit chip 200 and the conductive pads of the memory array chip 300.

The chain wire 31 has a bonding portion (or a joint portion) where the conductive pad 313 of the peripheral circuit chip 200 and the conductive pad 318 of the memory array chip 300 are bonded to each other to electrically connect the conductive pad 313 and the conductive pad 318. The conductive pad 31Ac is electrically connected to one end of the link wiring 31, and the conductive pad 31Ad is electrically connected to the other end of the link wiring 31.

In embodiment 1, the electrical connection state between the conductive pad 31Ac and the conductive pad 31Ad is studied. For example, the resistance between the conductive pad 31Ac and the conductive pad 31Ad is measured using a probe apparatus.

When the resistance between the conductive pad 31Ac and the conductive pad 31Ad is equal to or less than a predetermined resistance value, it is determined that peeling or the like does not occur at the bonded portion between the conductive pad of the peripheral circuit chip 200 and the conductive pad of the memory array chip 300, and thus there is no problem. On the other hand, when the resistance between the conductive pad 31Ac and the conductive pad 31Ad is higher than a predetermined resistance value, it is determined that peeling or the like occurs at the bonded portion between the conductive pad of the peripheral circuit chip 200 and the conductive pad of the memory array chip 300.

In this way, after the conductive pad 313 of the peripheral circuit chip 200 and the conductive pad 318 of the memory array chip 300 are bonded to each other, the resistance between the conductive pad 31Ac and the conductive pad 31Ad is measured, whereby the bonding state or the electrical connection state between the conductive pad of the peripheral circuit chip 200 and the conductive pad of the memory array chip 300 is detected.

The chain wiring 31 is provided along 4 sides of the semiconductor memory device 1, i.e., the left LS, right RS, upper TS, and lower BS. The resistance in each link wiring is measured using a conductive pad 31Ac connected to one end of each link wiring corresponding to each of the left LS, right RS, upper TS, and lower BS, and a conductive pad 31Ad connected to the other end of each link wiring. This makes it possible to detect which of the chain lines corresponding to the left LS, right RS, upper TS, and lower BS has a conductive pad peeled off. For example, if the resistances between the conductive pad 31Ac and the conductive pad 31Ad connected to one end and the other end of the chain line corresponding to the left LS are measured, it is possible to detect whether or not peeling occurs at the bonded portion between the conductive pad 313 and the conductive pad 318 in the chain line 31 corresponding to the left LS.

In embodiment 1, the positional deviation between the peripheral circuit chip 200 and the memory array chip 300 during bonding is detected using the chain wiring 31 and the adjacent wirings 32 and 33. That is, it is detected whether a position deviation occurs between the conductive pads of the peripheral circuit chip 200 and the memory array chip 300 during the bonding of the peripheral circuit chip 200 and the memory array chip 300.

In the peripheral circuit chip 200 or the memory array chip 300, the adjacent wires 32 and 33 are disposed at a predetermined distance from the chain wire 31 with the chain wire 31 interposed therebetween. When the amount of positional displacement generated between the peripheral circuit chip 200 and the memory array chip 300 after the peripheral circuit chip 200 and the memory array chip 300 are bonded is smaller than a predetermined distance, the chain wire 31 and the adjacent wire 32 or 33 are not in contact with each other, and the chain wire and the adjacent wire are electrically insulated from each other. On the other hand, when the amount of positional deviation is equal to or greater than the predetermined distance, the chain wire 31 comes into contact with the adjacent wire 32 or 33, and the chain wire and the adjacent wire are brought into a conductive state or a low impedance state.

In embodiment 1, the electrical connection state between the conductive pad 31Ac and the conductive pad 32Ab or 33Ab is studied. For example, using a probe apparatus, the resistances between the conductive pad 31Ac and the conductive pad 32Ab and between the conductive pad 31Ac and the conductive pad 33Ab are measured.

When the resistance between the conductive pad 31Ac and the conductive pad 32Ab or 33Ab is very large and the conductive pad 31Ac and the conductive pad 32Ab or 33Ab are in an insulated state, it is determined that the amount of positional displacement generated when the peripheral circuit chip 200 and the memory array chip 300 are bonded falls within the allowable range. On the other hand, when the resistance between the conductive pad 31Ac and the conductive pad 32Ab or 33Ab is very small, or when the conductive pad 31Ac and the conductive pad 32Ab or 33Ab are in a conductive state, it is determined that the amount of positional displacement generated when the peripheral circuit chip 200 and the memory array chip 300 are bonded exceeds the allowable range.

In this way, by measuring the electrical connection state between the conductive pad 31Ac and the conductive pad 32Ab or 33Ab after bonding the conductive pad of the peripheral circuit chip 200 and the conductive pad of the memory array chip 300, it is possible to detect whether or not the amount of positional displacement when bonding the peripheral circuit chip 200 and the memory array chip 300 is within the allowable range.

The chain wiring 31 and the adjacent wirings 32 and 33 are provided along 4 sides of the semiconductor memory device 1. Therefore, it is possible to detect in which direction, for example, in the X direction or the Y direction, a positional deviation occurs, based on which of the adjacent wirings 32 or 33 provided along the 4 sides is in the conductive state.

1.3 Effect of embodiment 1

According to embodiment 1, as described above, by using the chain wires 31 and the adjacent wires 32 and 33 provided in the end region 30, a bonding failure (or a peeling failure) when the peripheral circuit chip 200 and the memory array chip 300 are bonded, that is, a bonding failure between the conductive pads of the peripheral circuit chip 200 and the conductive pads of the memory array chip 300 can be detected.

Further, it is possible to detect whether or not there is peeling between the conductive pads for each of the chain wirings corresponding to the left LS, right RS, upper TS, and lower BS of the semiconductor memory device 1. Therefore, the portion where peeling occurs between the conductive pads can be specified, and peeling failure can be easily analyzed.

Further, using the chain wiring 31 and the adjacent wirings 32 and 33 in the end region 30, it is possible to detect whether or not the positional deviation failure when the peripheral circuit chip 200 and the memory array chip 300 are bonded, that is, the positional deviation amount between the conductive pad of the peripheral circuit chip 200 and the conductive pad of the memory array chip 300 is within the allowable range.

Further, the positional deviation can be detected for each of the chain wirings and the adjacent wirings corresponding to the left LS, the right RS, the upper TS, and the lower BS of the semiconductor memory device 1. Therefore, it is possible to specify in which direction the positional deviation occurs, and it is possible to easily analyze the positional deviation failure.

As described above, according to embodiment 1, a bonding failure (or peeling failure) between the conductive pads and a misalignment failure in bonding the peripheral circuit chip 200 and the memory array chip 300 can be easily detected. This reduces the flow of defective semiconductor memory devices, and thus provides a semiconductor memory device with improved operational reliability. Furthermore, since a bonding failure and a misalignment failure between the peripheral circuit chip 200 and the memory array chip 300 can be easily analyzed, the productivity of the semiconductor memory device can be improved.

2. Embodiment 2

In embodiment 2, a description will be given of a chain wire and an adjacent wire having different configurations from the chain wire 31 and the adjacent wires 32 and 33 in embodiment 1. The configuration, operation, and the like not described below are the same as those of embodiment 1. In embodiment 2, differences from embodiment 1 will be mainly described.

Embodiment 2 is an example in which conductive layers are added as a chain wiring and an adjacent wiring in the peripheral circuit chip 200 and the memory array chip 300, respectively. A conductive layer serving as a chain wiring or an adjacent wiring is further provided on the semiconductor substrate 70 side of the conductive layer 311 in the peripheral circuit chip 200. In the memory array chip 300, a conductive layer serving as a link wiring or an adjacent wiring is further provided on the semiconductor substrate 50 side of the conductive layer 316.

2.1 details of the end region of embodiment 2

The chain wiring and the adjacent wiring in the end region 30 of embodiment 2 will be described in detail with reference to fig. 17 to 21. In addition, in fig. 17 to 21 in embodiment 2, only the conductive layer, the through hole, and the conductive pad constituting the link wiring and the adjacent wiring are shown, and other configurations are omitted. The same applies to the following embodiments.

Fig. 17 is a plan view schematically showing the chain wire 31_1 and the adjacent wires 32_1 and 33_1 provided in the end region 30 according to embodiment 2. Fig. 17 shows the chain wiring 31_1 and the adjacent wirings 32_1 and 33_1 along the upper TS of the left LS, the right RS, the upper TS, and the lower BS. The conductive pads for measurement of the respective chain wirings 31_1 and adjacent wirings 32_1 and 33_1 along the left LS, right RS, and lower BS are different, and other configurations are also the same as those shown in fig. 17 to 21.

Fig. 18 is a sectional view taken along the line C1-C1 (or chain wiring) in fig. 17, and fig. 19 is a sectional view taken along the line C2-C2 (or adjacent wiring) in fig. 17. Fig. 20 and 21 are sectional views taken along lines C3-C3 and C4-C4 in fig. 17, respectively.

As shown in fig. 17, a chain wire 31_1 and adjacent wires 32_1 and 33_1 are provided in the end region 30. The chain line 31_1 is disposed adjacent to the adjacent lines 32_1 and 33_ 1. The link wiring 31_1 is arranged between the adjacent wirings 32_1 and 33_ 1.

As shown in fig. 17, 18, and 21, the link wiring 31_1 includes a conductive pad 313, a via 312, a conductive layer 311, a via 310, and a conductive layer 309 in the peripheral circuit chip 200, and a conductive pad 318, a via 317, a conductive layer 316, a via 315, and a conductive layer 314 in the memory array chip 300.

As shown in fig. 18, in the peripheral circuit chip 200, the conductive layer 309 extends in the X direction. The plurality of conductive pads 313 are arranged in the X direction at a designated interval. The conductive pad 313 is electrically connected to one end of the conductive layer 309 through the via 312, the conductive layer 311 and the via 310 in sequence. Another conductive pad 313 is electrically connected to the other end of the conductive layer 309 through the via 312, the conductive layer 311 and the via 310 in sequence.

Within memory array chip 300, conductive layer 314 extends in the X-direction. A plurality of conductive pads 318 are arranged at a designated interval in the X direction. A conductive pad 318 is electrically connected to one end of the conductive layer 314 through the via 317, the conductive layer 316 and the via 315 in sequence. Another conductive pad 318 is electrically connected to the other end of the conductive layer 314 through the via 317, the conductive layer 316 and the via 315 in sequence.

The conductive pad 31Ac is electrically connected to the conductive layer 314 through a via hole, a conductive layer, and a contact plug (not shown). The conductive pad 31Ad is electrically connected to the other conductive layer 314 through a via, a conductive layer, and a contact plug (not shown).

With this structure, the conductive pad 31Ac and the conductive pad 31Ad are electrically connected through the conductive layer 316, the via 315, the conductive layer 316, the via 317, the conductive pad 318, the conductive pad 313, the via 312, the conductive layer 311, the via 310, and the conductive layer 309.

As shown in fig. 17, 19, 20, and 21, the adjacent wiring 32_1 includes a conductive pad 323, a via hole 322, a conductive layer 321, a via hole 320, and a conductive layer 319 in the peripheral circuit chip 200, and a conductive pad 328, a via hole 327, a conductive layer 326, a via hole 325, and a conductive layer 324 in the memory array chip 300.

As shown in fig. 19, in the peripheral circuit chip 200, the conductive layer 321 extends in the X direction. A plurality of conductive pads 323 and vias 322 are arranged at a designated interval in the X direction. Each conductive pad 323 is electrically connected to the conductive layer 321 through the via 322. The conductive layer 319 extends in the X direction. A plurality of vias 320 are disposed between conductive layer 321 and conductive layer 319. The through holes 320 are arranged at a prescribed interval in the X direction. Each conductive pad 323 is electrically connected to via 322, conductive layer 321, via 320, and conductive layer 319.

Within memory array chip 300, conductive layer 326 extends in the X-direction. A plurality of conductive pads 328 and vias 327 are arranged at designated intervals in the X direction. Each conductive pad 328 is electrically connected to the conductive layer 326 through a via 327. The conductive layer 324 extends in the X direction. A plurality of vias 325 are disposed between the conductive layer 326 and the conductive layer 324. The through holes 325 are arranged in the X direction at a prescribed interval. Each conductive pad 328 is electrically connected to the via 327, the conductive layer 326, the via 325, and the conductive layer 324.

The conductive pad 32Ab is electrically connected to the conductive layer 324 through a via hole, a conductive layer, and a contact plug (not shown).

With this structure, the conductive pad 32Ab is electrically connected to the conductive layer 324, the via 325, the conductive layer 326, the via 327, the conductive pad 328, the conductive pad 323, the via 322, the conductive layer 321, the via 320, and the conductive layer 319.

2.2 actions of embodiment 2

In embodiment 2, the bonding state (or electrical connection state) of the conductive pad 313 of the peripheral circuit chip 200 and the conductive pad 318 of the memory array chip 300 by bonding is detected using the link wiring 31_ 1.

For example, the joint state between the conductive pad of the peripheral circuit chip 200 and the conductive pad of the memory array chip 300 is detected by measuring the resistance between the conductive pad 31Ac connected to one end of the chain wiring 31_1 and the conductive pad 31Ad connected to the other end of the chain wiring 31_1 using a probe device.

In embodiment 2, the positional deviation in the bonding of the peripheral circuit chip 200 and the memory array chip 300 is detected using the chain wiring 31_1 and the adjacent wirings 32_1 and 33_ 1.

For example, using a probe apparatus, the resistances between the conductive pad 31Ac connected to the link wiring 31_1 and the conductive pad 32Ab connected to the adjacent wiring 32_1 and between the conductive pad 31Ac and the conductive pad 33Ab connected to the adjacent wiring 33_1 are measured, thereby detecting whether or not the amount of positional deviation when the peripheral circuit chip 200 and the memory array chip 300 are bonded is within the allowable range. The other points are the same as those in embodiment 1.

2.3 Effect of embodiment 2

According to embodiment 2, as in embodiment 1, a bonding failure (or peeling failure) between the conductive pads and a misalignment failure in bonding the peripheral circuit chip 200 and the memory array chip 300 can be easily detected. This reduces the flow of defective semiconductor memory devices, and thus provides a semiconductor memory device with improved operational reliability. Furthermore, since a bonding failure and a misalignment failure between the peripheral circuit chip 200 and the memory array chip 300 can be easily analyzed, the productivity of the semiconductor memory device can be improved.

Further, in embodiment 2, the conductive layer 309 is provided on the semiconductor substrate 70 side with respect to the conductive layer 311 in the peripheral circuit chip 200, and the conductive layer 314 is provided on the semiconductor substrate 50 side with respect to the conductive layer 316 in the memory array chip 300. These conductive layers 309 and 314 function as conductive layers constituting the chain wiring 31_1 and also function as crack blocking layers for preventing cracks from entering from the cutting line 101. Other effects are the same as those of embodiment 1.

3. Embodiment 3

In embodiment 3, a chain wiring and an adjacent wiring having a different configuration from those in embodiments 1 and 2 will be described. The configuration, operation, and the like not described below are the same as those of embodiment 1. In embodiment 3, differences from embodiment 1 will be mainly described.

In embodiment 3, conductive pads for detecting positional displacement are arranged between the conductive pads 313 and 318 constituting the chain wiring. This makes it possible to detect not only a positional shift in the direction (or Y direction) perpendicular to the chain wiring but also a positional shift in the direction (or X direction) along the chain wiring.

3.1 details of the end region of embodiment 3

The chain wiring and the adjacent wiring in the end region 30 of embodiment 3 will be described in detail with reference to fig. 22 to 27.

Fig. 22 is a plan view schematically showing the chain wire 31_2 and the adjacent wires 32_2 and 33_2 provided in the end region 30 according to embodiment 3. Fig. 22 shows the chain wiring 31_2 and the adjacent wirings 32_2 and 33_2 along the upper TS of the left LS, the right RS, the upper TS, and the lower BS. The conductive pads for measurement of the respective chain wirings 31_2 and adjacent wirings 32_2 and 33_2 along the left LS, right RS, and lower BS are different, and other configurations are also the same as those shown in fig. 22 to 27.

Fig. 23 is a sectional view taken along the line D1-D1 (or chain wiring) in fig. 22, and fig. 24 is a sectional view taken along the line D2-D2 (or adjacent wiring) in fig. 22. Further, fig. 25, 26 and 27 are sectional views taken along lines D3-D3, D4-D4 and D5-D5 in fig. 22, respectively.

As shown in fig. 22, a chain wire 31_2 and adjacent wires 32_2 and 33_2 are provided in the end region 30. The chain line 31_2 is disposed adjacent to the adjacent lines 32_2 and 33_ 2. The link wiring 31_2 is arranged between the adjacent wirings 32_2 and 33_ 2.

As shown in fig. 22, 23, 25, 26, and 27, the link wiring 31_2 includes a conductive pad 313, a via 312, a conductive layer 311, a conductive pad 313A, a via 312A, a conductive layer 311A, a via 310A, and a conductive layer 309 in the peripheral circuit chip 200, and a conductive pad 318, a via 317, a conductive layer 316, a conductive pad 318A, a via 317A, a conductive layer 316A, a via 315A, and a conductive layer 314 in the memory array chip 300.

As shown in fig. 23, in the peripheral circuit chip 200, the conductive layer 311 extends in the X direction. The plurality of conductive pads 313 are arranged in the X direction at a designated interval. The conductive pad 313 is electrically connected to one end of the conductive layer 311 through the via 312. Another conductive pad 313 is electrically connected to the other end of the conductive layer 311 through the via 312. The conductive layer 309 extends in the X direction. A conductive pad 313A is disposed between the conductive pad 313 and another conductive pad 313. The conductive pad 313A is electrically connected to the conductive layer 309 through the via 312A, the conductive layer 311A and the via 310A in sequence.

Within memory array chip 300, conductive layer 316 extends in the X-direction. A plurality of conductive pads 318 are arranged at a designated interval in the X direction. The conductive pad 318 is electrically connected to one end of the conductive layer 316 through the via 317. Another conductive pad 318 is electrically connected to the other end of conductive layer 316 through via 317. The conductive layer 314 extends in the X direction. A conductive pad 318A is disposed between the conductive pad 318 and another conductive pad 318. The conductive pad 318A is electrically connected to the conductive layer 314 through the via 317A, the conductive layer 316A and the via 315A in sequence.

The conductive pads 313 and 318, and the conductive pads 313A and 318A are disposed at corresponding positions in the Z-direction. The conductive pad 313 and the conductive pad 318, and the conductive pad 313A and the conductive pad 318A are attached in an opposite manner.

The conductive pad 31Ac is electrically connected to the conductive layer 316 through a via hole, a conductive layer, and a contact plug (not shown). The conductive pad 31Ad is electrically connected to the other conductive layer 316 through a via hole, a conductive layer, and a contact plug (not shown). The conductive pad 31Ai is electrically connected to the conductive layer 314 through a via hole, a conductive layer, and a contact plug (not shown).

As shown in fig. 24, the arrangement intervals of the conductive pads 323 and 328 and the through holes 322 and 327 of the adjacent wiring 32_2 are narrower than those of the adjacent wiring 32 shown in fig. 14 in embodiment 1. The other structure is the same as that of the adjacent wiring 32. Note that the adjacent wiring 33_2 has the same configuration as the adjacent wiring 32_2, and therefore, the description thereof is omitted.

3.2 actions of embodiment 3

In embodiment 3, the bonding state of the conductive pad 313 of the peripheral circuit chip 200 and the conductive pad 318 of the memory array chip 300 by bonding is detected using the link wiring 31_ 2.

For example, the joint state between the conductive pad of the peripheral circuit chip 200 and the conductive pad of the memory array chip 300 is detected by measuring the resistance between the conductive pad 31Ac connected to one end of the chain wiring 31_2 and the conductive pad 31Ad connected to the other end of the chain wiring 31_2 using a probe device.

In embodiment 3, the positional deviation in the bonding of the peripheral circuit chip 200 and the memory array chip 300 is detected using the chain wiring 31_2 and the adjacent wirings 32_2 and 33_ 2.

For example, using a probe apparatus, the resistances between the conductive pad 31Ac connected to the link wiring 31_2 and the conductive pad 32Ab connected to the adjacent wiring 32_2 and between the conductive pad 31Ac and the conductive pad 33Ab connected to the adjacent wiring 33_2 are measured, thereby detecting whether or not the amount of positional deviation when the peripheral circuit chip 200 and the memory array chip 300 are bonded is within the allowable range. The other points are the same as those in embodiment 1.

3.3 Effect of embodiment 3

According to embodiment 3, as in embodiment 1, a bonding failure (or peeling failure) between the conductive pads and a misalignment failure in bonding the peripheral circuit chip 200 and the memory array chip 300 can be easily detected. This reduces the flow of defective semiconductor memory devices, and thus provides a semiconductor memory device with improved operational reliability. Furthermore, since a bonding failure and a misalignment failure between the peripheral circuit chip 200 and the memory array chip 300 can be easily analyzed, the productivity of the semiconductor memory device can be improved.

Further, in embodiment 3, by disposing the conductive pad 318A between the conductive pads 313 constituting the chain wiring 31_2, it is possible to detect a positional deviation in the direction (X direction) along the chain wiring 31_ 2.

Further, similarly to embodiment 2, the conductive layer 309 is provided on the semiconductor substrate 70 side with respect to the conductive layer 311 in the peripheral circuit chip 200, and the conductive layer 314 is provided on the semiconductor substrate 50 side with respect to the conductive layer 316 in the memory array chip 300. These conductive layers 309 and 314 function as conductive layers constituting the chain wiring 31_2 and also function as crack blocking layers for preventing cracks from entering from the cutting line 101. Other effects are the same as those of embodiment 1.

4. Embodiment 4

In embodiment 4, a description will be given of a chain wiring and an adjacent wiring having different configurations from those in embodiments 1 to 3. The configuration, operation, and the like not described below are the same as those of embodiment 1. In embodiment 4, differences from embodiment 1 will be mainly described.

In embodiment 4, as in embodiment 3, conductive pads for detecting positional deviation are arranged between the conductive pads 313 and 318 constituting the link wirings, and the adjacent wiring 32_3 and the adjacent wiring 33_3 are electrically connected. This makes it possible to detect not only a positional shift in a direction perpendicular to the chain wiring but also a positional shift in a direction along the chain wiring.

4.1 details of the end region of embodiment 4

The chain wiring and the adjacent wiring in the end region 30 of embodiment 4 will be described in detail with reference to fig. 28 to 33.

Fig. 28 is a plan view schematically showing the chain wire 31_3 and the adjacent wires 32_3 and 33_3 provided in the end region 30 according to embodiment 4. Fig. 28 shows the chain wiring 31_3 and the adjacent wirings 32_3 and 33_3 along the upper TS of the left LS, the right RS, the upper TS, and the lower BS. The conductive pads for measurement of the respective chain wirings 31_3 and adjacent wirings 32_3 and 33_3 along the left LS, right RS, and lower BS are different, and other configurations are also the same as those shown in fig. 28 to 33.

Fig. 29 is a sectional view taken along the line E1-E1 (or chain wiring) in fig. 28, and fig. 30 is a sectional view taken along the line E2-E2 (or adjacent wiring) in fig. 28. Fig. 31, 32, and 33 are cross-sectional views taken along lines E3-E3, E4-E4, and E5-E5 in fig. 28, respectively.

As shown in fig. 28, a chain wire 31_3 and adjacent wires 32_3 and 33_3 are provided in the end region 30. The chain wire 31_3 is disposed adjacent to the adjacent wires 32_3 and 33_ 3. The link wiring 31_3 is arranged between the adjacent wirings 32_3 and 33_ 3.

As shown in fig. 28, 29, 31, 32, and 33, the link wiring 31_3 includes a conductive pad 313, a via 312, a conductive layer 311, a conductive pad 313A, a via 312A, and a conductive layer 311A in the peripheral circuit chip 200, and a conductive pad 318, a via 317, a conductive layer 316, a conductive pad 318A, a via 317A, and a conductive layer 316A in the memory array chip 300.

As shown in fig. 29, in the peripheral circuit chip 200, the conductive layer 311 extends in the X direction. The plurality of conductive pads 313 are arranged in the X direction at a designated interval. The conductive pad 313 is electrically connected to one end of the conductive layer 311 through the via 312. Another conductive pad 313 is electrically connected to the other end of the conductive layer 311 through the via 312. A conductive pad 313A is disposed between the conductive pad 313 and another conductive pad 313. The conductive pad 313A is electrically connected to the conductive layer 311A through the via 312A.

Within memory array chip 300, conductive layer 316 extends in the X-direction. A plurality of conductive pads 318 are arranged at a designated interval in the X direction. The conductive pad 318 is electrically connected to one end of the conductive layer 316 through the via 317. Another conductive pad 318 is electrically connected to the other end of conductive layer 316 through via 317. A conductive pad 318A is disposed between the conductive pad 318 and another conductive pad 318. The conductive pad 318A is electrically connected to the conductive layer 314 through the via 317A.

The conductive pad 313 and the conductive pad 318, and the conductive pad 313A and the conductive pad 318A are attached in an opposite manner.

The conductive pad 31Ac is electrically connected to the conductive layer 316 through a via hole, a conductive layer, and a contact plug (not shown). The conductive pad 31Ad is electrically connected to the other conductive layer 316 through a via hole, a conductive layer, and a contact plug (not shown).

As shown in fig. 30, the adjacent wire 32_3 has a narrower arrangement interval of the conductive pads 323 and 328 as compared with the structure of the adjacent wire 32 in embodiment 1 shown in fig. 14, similarly to embodiment 3. The other structure is the same as embodiment 1. Note that the adjacent wiring 33_3 has the same configuration as the adjacent wiring 32_3, and therefore, the description thereof is omitted.

4.2 actions of embodiment 4

In embodiment 4, the bonding state of the conductive pad 313 of the peripheral circuit chip 200 and the conductive pad 318 of the memory array chip 300 by bonding is detected using the link wiring 31_ 3.

For example, the joint state between the conductive pad of the peripheral circuit chip 200 and the conductive pad of the memory array chip 300 is detected by measuring the resistance between the conductive pad 31Ac connected to one end of the chain wiring 31_3 and the conductive pad 31Ad connected to the other end of the chain wiring 31_3 using a probe device.

In embodiment 4, the positional deviation between the peripheral circuit chip 200 and the memory array chip 300 during bonding is detected using the chain wiring 31_3 and the adjacent wirings 32_3 and 33_ 3.

For example, using a probe apparatus, the resistances between the conductive pad 31Ac connected to the link wiring 31_3 and the conductive pad 32Ab connected to the adjacent wiring 32_3 and between the conductive pad 31Ac and the conductive pad 33Ab connected to the adjacent wiring 33_3 are measured, thereby detecting whether or not the amount of positional deviation when the peripheral circuit chip 200 and the memory array chip 300 are bonded is within the allowable range. The other points are the same as those in embodiment 1.

4.3 Effect of embodiment 4

According to embodiment 4, as in embodiment 1, a bonding failure (or peeling failure) between the conductive pads and a misalignment failure in bonding the peripheral circuit chip 200 and the memory array chip 300 can be easily detected. This reduces the flow of defective semiconductor memory devices, and thus provides a semiconductor memory device with improved operational reliability. Furthermore, since a bonding failure and a misalignment failure between the peripheral circuit chip 200 and the memory array chip 300 can be easily analyzed, the productivity of the semiconductor memory device can be improved.

Further, in embodiment 4, by disposing the conductive pad 318A between the conductive pads 313 constituting the chain wiring 31_3, it is possible to detect a positional deviation in the direction (X direction) along the chain wiring 31_ 3. Other effects are the same as those of embodiment 1.

5. Other examples of variations and the like

In the above embodiment, the NAND flash memory is described as an example of the semiconductor memory device, but the present invention is not limited to the NAND flash memory, and can be applied to all other semiconductor memories, and further, can be applied to various memory devices other than the semiconductor memory.

Several embodiments of the present invention have been described, but these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments may be implemented in other various ways, and various omissions, substitutions, and changes may be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalent scope thereof.

[ description of symbols ]

1 semiconductor memory device

10 memory cell region

11 memory cell array

20 peripheral circuit region

21 input/output circuit

22 logic control circuit

23 ready/busy circuit

24 register group

25 sequencer (or control circuit)

26 voltage generating circuit

27 driver

28-row decoder module

29 column decoder

30 end region

31. 31_1, 31_2, 31_3 chain wiring

31A conductive pad

31Aa, 31Ab, 31Ac, 31Ad, 31Ae, 31Af, 31Ag, 31Ah conductive pad

32. 32_1, 32_2, and 32_3 adjacent wirings

32A conductive pad

32Aa, 32Ab, 32Ac, 32Ad conductive pads

33. 33_1, 33_2, and 33_3 adjacent wirings

33A conductive pad

33Aa, 33Ab, 33Ac, 33Ad conductive pads

40 sense amplifier module

BL, BL 0-BLi bit lines

BLK, BLK0 BLKm Block

MP storage column

MT, MT 0-MT 7 memory cell transistor

SGD, SGD 0-SGD 3 select gate lines

SGS select gate line

SL source line

ST1, ST2 selection transistor

SU, SU 0-SU 3 string unit

WL, WL 0-WL 7 word lines