阅读说明：本技术 半导体装置及半导体装置的制造方法 (Semiconductor device and method for manufacturing semiconductor device ) 是由 李南宰 于 2020-06-09 设计创作，主要内容包括：提供了半导体装置及半导体装置的制造方法。半导体装置包括：源极结构,其形成在基底上；蚀刻防止层,其形成在源极结构上；位线；层叠结构,其位于蚀刻防止层和位线之间,并包括彼此交替层叠的导电层和绝缘层；以及沟道结构,其穿过层叠结构和蚀刻防止层,其中,沟道结构的下部位于源极结构中,并且沟道结构的下部的侧壁与源极结构直接接触。(A semiconductor device and a method for manufacturing the semiconductor device are provided. The semiconductor device includes: a source structure formed on a substrate; an etch prevention layer formed on the source structure; a bit line; a stacked structure between the etch prevention layer and the bit line and including conductive layers and insulating layers alternately stacked with each other; and a channel structure passing through the stacked structure and the etch prevention layer, wherein a lower portion of the channel structure is located in the source structure, and a sidewall of the lower portion of the channel structure is in direct contact with the source structure.)

1. A semiconductor device, comprising:

a source structure formed on a substrate;

an etch prevention layer formed on the source structure;

a bit line;

a stacked structure located between the etch prevention layer and the bit line and including conductive layers and insulating layers alternately stacked with each other; and

a channel structure passing through the laminated structure and the etch prevention layer,

wherein a lower portion of the channel structure is located in the source structure and sidewalls of the lower portion of the channel structure are in direct contact with the source structure.

2. The semiconductor device according to claim 1, wherein the etching prevention layer comprises silicon carbonitride (SiCN).

3. The semiconductor device of claim 1, wherein the source structure comprises:

a first source layer formed on the substrate; and

a second source layer between the first source layer and the etch prevention layer and in direct contact with the lower portion of the channel structure.

4. The semiconductor device according to claim 3, wherein the etching prevention layer is interposed in an interface between the second source layer and the stacked structure.

5. The semiconductor device according to claim 3, wherein the first and second semiconductor layers are stacked,

wherein the channel structure comprises a gap fill layer, a channel layer, and a memory layer,

wherein the channel layer is formed on a sidewall of the gap filling layer,

wherein the memory layer is formed on a sidewall of the channel layer, and

wherein the gap filling layer penetrates the stacked structure, the etch prevention layer, and the second source layer.

6. The semiconductor device of claim 5, wherein a portion of the channel layer of the lower portion of the channel structure is exposed, and the exposed portion of the channel layer is in direct contact with the second source layer.

7. The semiconductor device of claim 5, wherein the lower portion of the channel structure extends into the first source layer, and the first source layer is in contact with the memory layer.

8. The semiconductor device of claim 1, wherein the source structure comprises a polysilicon layer comprising one of an N-type dopant and a P-type dopant.

9. The semiconductor device according to claim 1, further comprising:

a slit passing through the laminated structure and the etching prevention layer;

a source contact structure formed in the slit; and

spacers surrounding sidewalls of the source contact structure.

10. A method of manufacturing a semiconductor device, the method comprising:

forming a first source layer over a substrate;

forming a sacrificial layer over the first source layer;

forming an etch prevention layer over the sacrificial layer;

forming a stacked structure including first material layers and second material layers alternately stacked on each other on the etching prevention layer;

forming a channel structure through the stacked structure, the etch prevention layer, and the sacrificial layer and extending into the first source layer;

forming a slit passing through the stacked structure and the etch prevention layer and exposing the sacrificial layer; and

forming a second source layer directly coupled to the channel structure by removing the sacrificial layer exposed through the slit and filling a space from which the sacrificial layer is removed with a conductive material.

11. The method of claim 10, wherein the etch-stop layer comprises silicon carbonitride, SiCN.

12. The method of claim 10, further comprising the steps of: after forming the slit and before removing the sacrificial layer:

removing the first material layer exposed through the slit;

forming a conductive layer in the space from which the first material layer is removed;

forming a spacer between the slit and the sacrificial layer; and

forming the spacer between the slit and the laminated structure.

13. The method of claim 12, further comprising the steps of: after removing the first material layer, a barrier layer is formed along the surface of the entire structure.

14. The method of claim 10, further comprising the steps of:

forming a channel hole through the stacked structure, the etch prevention layer, and the sacrificial layer and extending into the first source layer; and

a channel layer and a memory layer surrounding the channel layer are formed in the channel hole.

15. The method of claim 14, further comprising the steps of: after removing the sacrificial layer, removing an exposed portion of the memory layer of a lower portion of the channel structure to expose the channel layer.

16. A method of manufacturing a semiconductor device, the method comprising:

forming an etch prevention layer over the sacrificial layer;

forming a stacked structure including first material layers and second material layers alternately stacked on each other over the etch preventing layer;

forming a channel hole through the stacked structure, the etch prevention layer, and the sacrificial layer;

forming a channel structure including a channel layer and a memory layer surrounding the channel layer in the channel hole;

forming a slit through the stacked structure and the etch prevention layer to expose the sacrificial layer;

removing the sacrificial layer exposed through the slit to expose a portion of the memory layer in a lower portion of the channel structure;

removing the exposed portion of the memory layer to expose the channel layer; and

forming a second source layer directly coupled to the channel layer by filling the space from which the sacrificial layer is removed with a conductive material.

17. The method of claim 16, wherein the etch-prevention layer comprises silicon carbonitride, SiCN.

18. The method of claim 16, further comprising the steps of: forming the etch prevention layer to prevent the stacked structure from being etched during an etching process for removing the exposed portion of the memory layer.

19. The method of claim 16, further comprising the steps of: after forming the slit and before removing the sacrificial layer:

removing the first material layer exposed through the slit;

forming a conductive layer in the space from which the first material layer is removed; and

forming a spacer between the slit and the sacrificial layer; and

forming the spacer between the slit and the laminated structure.

20. The method of claim 19, wherein the step of forming the spacers comprises the steps of:

sequentially laminating a first spacer layer, a second spacer layer, a third spacer layer and a fourth spacer layer on the laminated structure between the slit and the laminated structure; and

forming an opening exposing the sacrificial layer by etching the first spacer layer, the second spacer layer, the third spacer layer, and the fourth spacer layer formed on the bottom surface of the slit.

Technical Field

Various embodiments relate generally to an electronic device, and more particularly, to a semiconductor device and a method of manufacturing the same.

Background

The nonvolatile memory device holds stored data without supplied power. The increase in integration density of a two-dimensional nonvolatile memory device in which memory cells are formed in a single layer over a substrate has recently been limited. Therefore, a three-dimensional nonvolatile memory device in which memory cells are stacked over a substrate in a vertical direction has been proposed.

The three-dimensional nonvolatile memory device may include interlayer insulating layers and gate electrodes alternately stacked with each other, and channel layers pass therethrough, and memory cells may be stacked along the channel layers. Various structures and manufacturing methods have been developed to improve the operational reliability of three-dimensional nonvolatile memory devices.

Disclosure of Invention

According to an embodiment, a semiconductor device may include: a source structure formed on a substrate; an etch prevention layer formed on the source structure; a bit line; a stacked structure between the etch prevention layer and the bit line and including conductive layers and insulating layers alternately stacked with each other; and a channel structure passing through the stacked structure and the etch prevention layer, wherein a lower portion of the channel structure is located in the source structure, and a sidewall of the lower portion of the channel structure is in direct contact with the source structure.

According to an embodiment, a method of manufacturing a semiconductor device may include: sequentially stacking and forming a first source layer, a sacrificial layer, and an etch prevention layer over a substrate; forming a stacked structure including first material layers and second material layers alternately stacked on each other on the etching prevention layer; forming a channel structure extending through the stacked structure, the etch prevention layer, and the sacrificial layer and into the first source layer; forming a slit passing through the laminated structure and the etch prevention layer and exposing the sacrificial layer; and forming a second source layer directly coupled to the channel structure by removing the sacrificial layer exposed through the slit and filling a space from which the sacrificial layer is removed with a conductive material.

According to an embodiment, a method of manufacturing a semiconductor device may include: sequentially stacking and forming a sacrificial layer and an etching prevention layer; forming a stacked structure including first material layers and second material layers alternately stacked on each other over the etching prevention layer; forming a channel hole through the stacked structure, the etch prevention layer, and the sacrificial layer; forming a channel structure including a channel layer and a memory layer surrounding the channel layer in the channel hole; forming a slit through the laminated structure and the etch prevention layer to expose the sacrificial layer; removing the sacrificial layer exposed through the slit to expose a portion of the memory layer in a lower portion of the channel structure; removing the exposed portion of the memory layer to expose the channel layer; and forming a second source layer directly coupled to the channel layer by filling the space from which the sacrificial layer is removed with a conductive material.

Drawings

Fig. 1A and 1B are sectional views illustrating a structure of a semiconductor device according to an embodiment;

fig. 2A, 2B, 2C, 2D, 2E, 2F, 2G, and 2H are sectional views illustrating a method of manufacturing a semiconductor device according to an embodiment;

fig. 3 is a block diagram illustrating a configuration of a memory system according to an embodiment;

fig. 4 is a block diagram illustrating a configuration of a memory system according to an embodiment;

FIG. 5 is a block diagram illustrating a configuration of a computing system according to an embodiment; and

FIG. 6 is a block diagram illustrating a computing system according to an embodiment.

Detailed Description

Hereinafter, various embodiments are described with reference to the drawings. In the drawings, the thickness and distance of components may be exaggerated compared to actual physical thickness and distance for convenience of explanation. In the following description, a description of known related functions and constructions may be omitted for simplicity and conciseness. Like reference numerals refer to like elements throughout the specification and drawings.

It should also be noted that in the present specification, "connected/coupled" means that one component is not only directly connected/coupled to another component, but also indirectly connected/coupled to another component through an intermediate component. When an element is referred to as being "directly on," "directly connected to" or "directly coupled to" another element or layer, there are no intervening elements or layers present. It will also be understood that when a layer is referred to as being "on" another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may also be present. In the specification, when an element is referred to as being "comprising" or "including" a component, it does not exclude the inclusion of other additional components, unless the context clearly dictates otherwise.

Various embodiments may relate to a semiconductor device having improved electrical characteristics and a method of manufacturing the semiconductor device.

Fig. 1A and 1B are sectional views illustrating the structure of a semiconductor device according to an embodiment. Fig. 1B is an enlarged view of the area a of fig. 1A.

Referring to fig. 1A, the semiconductor device may include a source structure S, a stacked structure ST, an etch prevention layer 12, a channel structure CH, a slit SL, and a bit line BL. In addition, the semiconductor device may further include at least one of a source contact structure 19, a spacer 18, and an interlayer insulating layer IL.

The source structure S may be a conductive layer including polysilicon, metal, or the like, and may be a single layer or a multilayer film. The source structure S may be located between the substrate 10 and the stack structure ST. The base 10 may be a semiconductor substrate, an insulating layer, or the like.

The source structure S may include a first source layer 11A and a second source layer 11B. The first source layer 11A may be located adjacent to the substrate 10, and the second source layer 11B may be located adjacent to the stacked structure ST. The second source layer 11B may be in physical contact with a sidewall of a lower portion of the channel structure CH, and more particularly, may be in direct contact with the channel layer 15 of the lower portion of the channel structure CH. The first source layer 11A may be in contact with a lower portion of the channel structure CH, and more particularly, may be in direct contact with the memory layer 16 of the lower portion of the channel structure CH.

The stacked structure ST may be located between the source structure S and the bit line BL. The laminated structure ST may include conductive layers 13 and insulating layers 14 alternately laminated with each other. The conductive layer 13 may be a select line, a word line, etc. The insulating layer 14 may be provided to insulate the stacked conductive layers 13 from each other, and may include an insulating material such as an oxide or a nitride.

The etching prevention layer 12 may be located in an interface between the source structure S and the stacked structure ST. The etch prevention layer 12 may include silicon carbonitride (SiCN). The etch prevention layer 12 may prevent the stack structure ST from being etched during an etching process for exposing the channel layer 15 of the lower portion of the channel structure CH.

The channel structure CH may be coupled between the bit line BL and the source structure S. The channel structure CH may pass through the stack structure ST and extend into the source structure S. The channel structure CH may include the channel layer 15, and may further include at least one of a memory layer 16 and a gap filling layer 17. The channel layer 15 located in the lower portion of the channel structure CH may be physically coupled to the source structure S through a sidewall thereof. For example, the channel layer 15 located in the lower portion of the channel structure CH may be physically coupled to the second source layer 11B through a sidewall of the channel layer 15. The channel layer 15 may include a semiconductor material such as silicon (Si) or germanium (Ge). The memory layer 16 may surround sidewalls of the channel layer 15. The memory layer 16 may include at least one of a charge blocking layer 16A, a data storage layer 16B, and a tunnel insulating layer 16C. The data storage layer 16B may include floating gates, charge trapping materials, polysilicon, nitride, variable resistance materials, phase change materials, nanodots, and the like. A gap filling layer 17 may be formed in the channel layer 15. The gap filling layer 17 may include an oxide layer.

A select transistor or memory cell may be located in each intersection of the channel structure CH and the conductive layer 13. The select transistors and the memory cells sharing a single channel layer 15 may form a single memory string. The memory string may include at least one drain select transistor, a plurality of memory cells, and at least one source select transistor coupled in series with each other.

The source contact structure 19 may pass through the stack structure ST to be coupled to the source structure S. The source contact structure 19 may be a conductive layer comprising polysilicon, metal, or the like. The source contact structure 19 may be a single layer or a multilayer film.

The spacer 18 may be interposed between the source contact structure 19 and the stacked structure ST. The spacer 18 may be formed on an inner wall of the slit SL and may surround a sidewall of the source contact structure 19. The spacer 18 may include an insulating layer and may be a single layer or a multilayer film.

Referring to fig. 1B, the source structure S may include a first source layer 11A stacked on the substrate 10 and a second source layer 11B stacked on the first source layer 11A. The first source layer 11A may surround a lower end of the channel structure CH, and the second source layer 11B may surround a portion of a lower portion of the channel structure CH in which the channel layer 15 is exposed, and may be in direct contact with the channel layer 15.

The first source layer 11A and the second source layer 11B may include a conductive layer such as a polysilicon layer, and may include an N-type dopant or a P-type dopant. For example, when the erase operation is performed by a Gate Induced Drain Leakage (GIDL) method, the first and second source layers 11A and 11B may include N-type dopants such as phosphorus (P).

The etching prevention layer 12 may be interposed in the interface between the second source layer 11B and the stacked structure ST. The etch prevention layer 12 may include silicon carbonitride (SiCN). The etch prevention layer 12 may prevent the stack structure ST from being etched during an etching process for exposing the channel layer 15 of the lower portion of the channel structure CH. Therefore, the thickness of the lowermost insulating layer 14 of the laminated structure ST can be reduced. Therefore, the distance d between the source structure S and the conductive layer 13 serving as a selection transistor can be reduced. Accordingly, a distance of impurity diffusion doped to the source structure S may be minimized, and a junction overlap region may be easily formed, so that a Gate Induced Drain Leakage (GIDL) current may be stably generated during an erase operation. In addition, the off characteristics of the selection transistors can be improved, so that the semiconductor device can be designed to minimize the number of selection transistors to be provided, and the integration density of the semiconductor device can also be improved.

The channel structure CH may pass through the stacked structure (i.e., the conductive layer 13 and the insulating layer 14) and the etching prevention layer 12, and extend into the source structure S. For example, the lower portion of the channel structure CH may penetrate through the second source layer 11B and penetrate into the first source layer 11A by a predetermined thickness. Fig. 1B illustrates that a lower portion of the channel structure CH passes through the first source layer 11A to contact the substrate 10. However, alternatively, the lower portion of the channel structure CH may pass through a portion of the first source layer 11A by a predetermined thickness such that the first source layer 11A surrounds the lower portion of the channel structure CH. The channel structure CH may include the channel layer 15, and may further include at least one of a memory layer 16 and a gap filling layer 17. The channel layer 15 may include a semiconductor material such as silicon (Si) or germanium (Ge). The memory layer 16 may surround sidewalls of the channel layer 15. The memory layer 16 may include at least one of a charge blocking layer 16A, a data storage layer 16B, and a tunnel insulating layer 16C. The data storage layer 16B may include floating gates, charge trapping materials, polysilicon, nitride, variable resistance materials, phase change materials, nanodots, and the like. A gap filling layer 17 may be formed in the channel layer 15. The gap filling layer 17 may include an oxide layer. A portion of the channel layer 15 in the lower portion of the channel structure CH passing through the second source layer 11B may be exposed to directly contact the second source layer 11B. In other words, the memory layer 16 surrounding the channel layer 15 may not be interposed between the second source layer 11B and a portion of the channel layer 15, which passes through the second source layer 11B, among the lower portion of the channel structure CH. Accordingly, a portion of the channel layer 15 passing through the second source layer 11B may be in direct contact with the second source layer 11B.

A select transistor or memory cell may be located in each intersection of the channel structure CH and the conductive layer 13. The select transistors and the memory cells sharing a single channel layer 15 may form a single memory string. The memory string may include at least one drain select transistor, a plurality of memory cells, and at least one source select transistor coupled in series with each other.

The spacer 18 may be a multilayer film including a first spacer 18A and a second spacer 18B. The first spacers 18A may include a material having an etch rate different from that of the second spacers 18B. For example, the first spacer 18A may include an oxide layer, and the second spacer 18B may include a nitride layer. The thickness of the second spacer 18B may be smaller than the thickness of the first spacer 18A. The second spacer 18B may be interposed between the first spacer 18A and the source contact structure 19.

The semiconductor device may further include a memory layer 19A. The memory layer 19A may be interposed between the conductive layer 13 and the insulating layer 14 and between the conductive layer 13 and the channel structure CH.

Fig. 2A to 2H are sectional views illustrating a method of manufacturing a semiconductor device according to an embodiment. Fig. 2D to 2H are enlarged views of a region B of fig. 2C and illustrate cross sections according to processes subsequent to the process shown in fig. 2C. Hereinafter, any repetitive description of the components already mentioned above will be omitted.

Referring to fig. 2A, a first source layer 21, a buffer layer 22, and a sacrificial layer 23 may be sequentially formed over a substrate 20. The first source layer 21 may include a polysilicon layer. The first source layer 21 may include an N-type impurity or a P-type impurity. The buffer layer 22 may include a nitride layer. The sacrificial layer 23 may include a polysilicon layer.

Subsequently, an upper portion of the sacrificial layer 23 may be planarized by performing a planarization process, and the etch prevention layer 24 may be formed on the sacrificial layer 23. The etch-preventing layer 24 may include silicon carbonitride (SiCN).

Referring to fig. 2B, a stacked structure ST may be formed on the etch prevention layer 24. The laminated structure ST may include first material layers 25 and second material layers 26 alternately laminated with each other. The first material layer 25 may be configured to form a gate electrode of a memory cell, a selection transistor, or the like. Second material layer 26 may be configured to insulate the stacked gate electrodes from each other. First material layer 25 may include a material having a high etch selectivity with respect to second material layer 26. For example, the first material layer 25 may be a sacrificial layer including nitride or the like, and the second material layer 26 may be an insulating layer including oxide or the like. Alternatively, the first material layer 25 may be a conductive layer including polysilicon, tungsten, or the like, and the second material layer 26 may be an insulating layer including oxide or the like.

Subsequently, a channel structure CH passing through the stacked structure ST, the etch prevention layer 24, the sacrificial layer 23, the buffer layer 22, and the first source layer 21 may be formed. The channel structure CH may penetrate the first source layer 21 to contact the substrate 20, or may penetrate a portion of the first source layer 21 by a predetermined thickness, so that a bottom surface of the channel structure CH may be located in the first source layer 21.

The method of forming the channel structure CH is as follows. First, a channel hole may be formed through the stacked structure ST, the etch prevention layer 24, the sacrificial layer 23, and the buffer layer 22 and into a portion of the first source layer 21 by at least a predetermined thickness. Subsequently, the memory layers 27 may be formed in the channel holes, respectively. Each memory layer 27 may include at least one of a charge blocking layer 27A, a data storage layer 27B, and a tunnel insulating layer 27C. Subsequently, the channel layers 28 may be formed in the channel holes, respectively. The channel layers 28 may respectively include a gap filling layer 29. Subsequently, an interlayer insulating layer 30 may be formed on the stacked structure ST.

Referring to fig. 2C, a slit SL may be formed. The slit SL may pass through the laminated structure ST and the etching prevention layer 24. The bottom surface SL _ BT of the slit SL may not completely penetrate the sacrifice layer 23, but may be located in the sacrifice layer 23. The slit SL may be formed by sequentially etching the interlayer insulating layer 30, the stacked structure ST, and the etch prevention layer 24 to expose a portion of the sacrificial layer 23.

Referring to fig. 2D, the first material layer 25 may be replaced by a third material layer 32 through the slits SL. According to an embodiment, when the first material layer 25 is a sacrificial layer and the second material layer 26 is an insulating layer, the first material layer 25 may be replaced with a conductive layer. For example, the first material layer 25 exposed through the slit SL may be removed, and the space from which the first material layer 25 has been removed may be filled with a conductive material to form a conductive layer (i.e., the third material layer 32). More specifically, the first material layer 25 exposed through the slit SL may be removed, and the barrier layer 31 may be formed along the surface of the entire structure from which the first material layer 25 is removed. Subsequently, a conductive material may be formed in the slits SL, and the conductive material formed in the slits SL may be etched to form a conductive layer (i.e., the third material layer 32). The stacked conductive layers may be electrically separated from each other by an etching process. According to another embodiment, when the first material layer 25 is a conductive layer and the second material layer 26 is an insulating layer, the first material layer 25 may be silicided.

Referring to fig. 2E, spacers 33 may be formed in the slits SL. The spacer 33 may be a multilayer film in which layers having different etching rates are alternately stacked on each other. For example, the first spacer layer 33A, the second spacer layer 33B, the third spacer layer 33C, and the fourth spacer layer 33D may be sequentially formed along the contour of the slit SL. The second and fourth spacer layers 33B and 33D may include a material having a high etch selectivity with respect to the first and third spacer layers 33A and 33C. The first spacer layer 33A and the third spacer layer 33C may include oxide layers. The second spacer layer 33B and the fourth spacer layer 33D may include a nitride layer.

Referring to fig. 2F, an opening OP exposing the sacrificial layer 23 may be formed by etching the first, second, third and fourth spacer layers 33A, 33B, 33C and 33D and the barrier layer 31 formed over the bottom surface of the slit SL using an etch-back process.

Referring to fig. 2G, the sacrificial layer 23 exposed through the opening OP may be removed. Accordingly, a portion of the sidewall of the lower portion of the channel structure CH may be exposed. Subsequently, the charge blocking layer 27A, the data storage layer 27B, and the tunnel insulating layer 27C of the exposed portion of the channel structure CH may be sequentially removed. When the data storage layer 27B is removed, the fourth spacer layer 33D may also be removed at the same time. For example, in the embodiment, when removing the data storage layer 27B and simultaneously removing the fourth spacer layer 33D means that if the removal of the data storage layer 27B occurs over a first interval of time and the removal of the fourth spacer layer 33D occurs over a second interval of time, the first interval and the second interval at least partially overlap each other so that there is a time when both the removal of the fourth spacer layer 33D and the removal of the data storage layer 27B occur. When the tunnel insulating layer 27C is removed, the third spacer layer 33C may also be removed at the same time. For example, in the embodiment, when the tunnel insulating layer 27C is removed and the third spacer layer 33C is simultaneously removed, it means that if the removal of the tunnel insulating layer 27C occurs on a first interval of time and the removal of the third spacer layer 33C occurs on a second interval of time, the first interval and the second interval at least partially overlap each other so that there is a time when both the removal of the third spacer layer 33C and the removal of the tunnel insulating layer 27C occur. In an embodiment, when removing the exposed portion of the memory layer 27 and simultaneously removing the third spacer layer 33C and the fourth spacer layer 33D, it means that if the removal of the memory layer 27 occurs over a first interval of time and the removal of the third spacer layer 33C and the fourth spacer layer 33D occurs over a second interval of time, the first interval and the second interval at least partially overlap each other such that there is a time when both the removal of the third spacer layer 33C and the fourth spacer layer 33D and the removal of the memory layer 27 occur. Accordingly, a portion of the channel layer 28 of the lower portion of the channel structure CH may be exposed. When the sacrificial layer 23, the charge blocking layer 27A, the data storage layer 27B, and the tunnel insulating layer 27C are sequentially removed by the etching process, the second material layer 26 located in the lowermost layer of the stacked structure ST may be protected by the etch prevention layer 24. Therefore, it may not be necessary to form the second material layer 26 located in the lowermost layer of the stack structure ST to have a large thickness or to form an additional source layer between the sacrificial layer 23 and the stack structure ST, thereby preventing damage to the stack structure during the etching process.

Referring to fig. 2H, a second source layer 34 may be formed in the space from which the sacrificial layer is removed, and a source contact structure 35 located in the slit SL may be formed. Each of the second source layer 34 and the source contact structure 35 may be a single layer. For example, the second source layer 34 and the source contact structure 35 may be formed by depositing a conductive material in the opening OP and the slit SL. The conductive material may include a polysilicon layer, a metal layer, and the like. The second source layer 34 and the source contact structure 35 may include dopants. The second source layer 34 may be in direct contact with the exposed portion of the channel layer 28 of the channel structure CH.

According to the above-described embodiment, the etch prevention layer may be formed in the interface between the sacrificial layer and the stacked structure ST, so that the stacked structure ST may be prevented from being etched during the etching process for exposing the channel layer 28 of the lower portion of the channel structure CH. Therefore, the distance d between the conductive layer (32) serving as the selection transistor and the second source layer 34 can be reduced. Accordingly, a distance of impurity diffusion doped to the source structure may be minimized, and a junction overlap region may be easily formed, so that a GIDL current may be stably generated during an erase operation. In addition, the off characteristics of the selection transistors can be improved, so that the semiconductor device can be designed to minimize the number of selection transistors to be provided, and the integration density of the semiconductor device can also be improved.

Fig. 3 is a block diagram illustrating a configuration of a memory system 1000 according to an embodiment.

Referring to fig. 3, a memory system 1000 according to an embodiment includes a memory device 1200 and a controller 1100.

The memory device 1200 may be used to store data information in a variety of data formats, such as text formats, graphics formats, and software code formats. The memory device 1200 may be a non-volatile memory device. Further, the memory device 1200 may have the structure described above with reference to fig. 1A and 1B, and may be manufactured by the manufacturing method described above with reference to fig. 2A to 2H. Since the memory device 1200 is configured and manufactured in the same manner as described above, a detailed description thereof will be omitted.

The controller 1100 may be coupled to a host and the memory device 1200 and configured to access the memory device 1200 in response to a request from the host. For example, the controller 1100 may control read operations, write operations, erase operations, and background operations of the memory device 1200.

The controller 1100 may include a Random Access Memory (RAM)1110, a Central Processing Unit (CPU)1120, a host interface 1130, an Error Correction Code (ECC) circuit 1140, a memory interface 1150, and the like.

The RAM 1110 may be used as an operation memory of the CPU 1120, a cache memory between the memory device 1200 and the host, a buffer memory between the memory device 1200 and the host, and the like. The RAM 1110 may be replaced with a Static Random Access Memory (SRAM), a Read Only Memory (ROM), or the like.

The CPU 1120 may control the overall operation of the controller 1100. For example, the CPU 1120 may operate firmware such as a Flash Translation Layer (FTL) stored in the RAM 1110.

The host interface 1130 may interface with a host interface. For example, the controller 1100 may communicate with the host through at least one of various interface protocols such as a Universal Serial Bus (USB) protocol, a multi-media card (MMC) protocol, a Peripheral Component Interconnect (PCI) protocol, a PCI-express (PCI-E) protocol, an Advanced Technology Attachment (ATA) protocol, a serial ATA (sata) protocol, a parallel ATA (pata) protocol, a Small Computer System Interface (SCSI) protocol, an Enhanced Small Disk Interface (ESDI) protocol, an Integrated Drive Electronics (IDE) protocol, and a proprietary protocol.

The ECC circuit 1140 may use an Error Correction Code (ECC) to detect and correct errors in data read from the memory device 1200.

The memory interface 1150 may interface with the memory device 1200. For example, the memory interface 1150 may include a NAND interface or a NOR interface.

The controller 1100 may further include a buffer memory (not shown) for temporarily storing data. The buffer memory may be used to temporarily store data to be transferred to an external device through the host interface 1130 or data to be transferred from the memory device 1200 through the memory interface 1150. The controller 1100 may further include a ROM storing code data for interfacing with a host.

Fig. 4 is a block diagram illustrating a configuration of a memory system 1000' according to an embodiment. Hereinafter, any repetitive description of the components already mentioned above will be omitted.

Referring to fig. 4, a memory system 1000 'according to an embodiment may include a memory device 1200' and a controller 1100. In addition, the controller 1100 may include a RAM 1110, a CPU 1120, a host interface 1130, an ECC circuit 1140, a memory interface 1150, and the like.

Memory device 1200' may be a non-volatile memory device. In addition, the memory device 1200' may have the structure described above with reference to fig. 1A and 1B, and may be manufactured by the manufacturing method described above with reference to fig. 2A to 2H. Since the memory device 1200' is configured and manufactured in the same manner as described above, a detailed description thereof will be omitted.

Further, the memory device 1200' may be a multi-chip package including a plurality of memory chips. The plurality of memory chips may be divided into a plurality of groups that can communicate with the controller 1100 through the first to k-th channels CH1 to CHk, respectively. In addition, the memory chips included in a single group may be adapted to communicate with the controller 1100 through a common channel. The memory system 1000' may be modified such that a single memory chip may be coupled to a single channel.

Since the memory device 1200 'is formed as a multi-chip package, the data storage capacity and driving speed of the memory system 1000' may be improved.

Fig. 5 is a block diagram illustrating a configuration of a computing system 2000 according to an embodiment. Hereinafter, any repetitive description of the components already mentioned above will be omitted.

Referring to fig. 5, the computing system 2000 according to the embodiment may include a memory device 2100, a CPU 2200, a RAM 2300, a user interface 2400, a power supply 2500, a system bus 2600, and the like.

The memory device 2100 may store data provided via the user interface 2400, data processed by the CPU 2200, and the like. The memory device 2100 may be electrically coupled to the CPU 2200, the RAM 2300, the user interface 2400, and the power supply 2500 through the system bus 2600. For example, the memory device 2100 may be coupled to the system bus 2600 by a controller (not shown), or alternatively may be coupled directly to the system bus 2600. When the memory device 2100 is directly coupled to the system bus 2600, the functions of the controller may be performed by the CPU 2200 and the RAM 2300.

The memory device 2100 may be a non-volatile memory device. Further, the memory device 2100 may have the structure described above with reference to fig. 1A and 1B, and may be manufactured by the manufacturing method described above with reference to fig. 2A to 2H.

In addition, as described above with reference to fig. 4, the memory device 2100 may be a multi-chip package including a plurality of memory chips.

The computing system 2000 having the above-described configuration may be configured as a computer, an ultra mobile pc (umpc), a workstation, a netbook, a Personal Digital Assistant (PDA), a portable computer, a web tablet, a wireless phone, a mobile phone, a smart phone, an electronic book, a Portable Multimedia Player (PMP), a portable game machine, a navigation device, a black box, a digital camera, a 3-dimensional television, a digital audio recorder, a digital audio player, a digital picture recorder, a digital picture player, a digital video recorder, a digital video player, a device capable of transmitting and receiving information in a wireless environment, one of various electronic devices for forming a home network, one of various electronic devices for forming a computer network, one of various electronic devices for forming a telematics network, an RFID device, or the like.

Fig. 6 is a block diagram illustrating a computing system 3000 according to an embodiment.

Referring to FIG. 6, a computing system 3000 according to embodiments may include software layers including an operating system 3200, applications 3100, a file system 3300, and a translation layer 3400. Further, computing system 3000 may include hardware layers such as memory device 3500.

The operating system 3200 may manage the software and hardware resources of the computing system 3000. The operating system 3200 may control program execution by the central processing unit. The applications 3100 may be various application programs that execute in the computing system 3000. The application 3100 may be an entity executed by the operating system 3200.

File system 3300 may refer to a logical structure configured to manage data and files present in computing system 3000. The file system 3300 may organize files or data to be stored in the memory device 3500 according to given rules. The file system 3300 may be determined from the operating system 3200 used in the computing system 3000. For example, when the operating system 3200 is a Microsoft Windows-based system, the file system 3300 may be a File Allocation Table (FAT), an NT file system (NTFS), or the like. In addition, when the operating system 3200 is a Unix/Linux-based system, the file system 3300 may be an extended file system (EXT), a Unix File System (UFS), a Journaling File System (JFS), or the like.

Fig. 6 illustrates the operating system 3200, the applications 3100, and the file system 3300 in separate blocks. However, the application 3100 and the file system 3300 may be included in the operating system 3200.

The translation layer 3400 may translate the address into an appropriate form for the memory device 3500 in response to a request from the file system 3300. For example, the translation layer 3400 may translate logical addresses generated by the file system 3300 to physical addresses of the memory device 3500. Mapping information of the logical address and the physical address may be stored in an address translation table. For example, translation layer 3400 may be a Flash Translation Layer (FTL), a universal flash link layer (ULL), or the like.

Memory device 3500 may be a non-volatile memory device. In addition, the memory device 3500 may have the structure described above with reference to fig. 1A and 1B, and may be manufactured by the manufacturing method described above with reference to fig. 2A to 2H.

The computing system 3000 having the above-described configuration can be divided into an operating system layer operating in an upper layer region and a controller layer operating in a lower layer region. Applications 3100, operating system 3200, and file system 3300 can be included in an operating system layer and can be driven by operating memory of computing system 3000. The conversion layer 3400 may be included in an operating system layer or a controller layer.

As described above, according to the present disclosure, it is possible to improve electrical characteristics of a semiconductor device by reducing a distance of impurity diffusion of a source structure coupled to a lower portion of a channel of the semiconductor device.

Embodiments have been disclosed herein and, although specific terms are employed, they are used and are to be interpreted in a generic and descriptive sense only and not for purposes of limitation. Accordingly, it will be understood by those of ordinary skill in the art to which the present disclosure pertains that various changes in form and details may be made therein without departing from the spirit and scope of the present specification as set forth in the following claims.

Cross Reference to Related Applications

This application claims priority from korean patent application No. 10-2019-.