阅读说明：本技术 一种晶体管结构及制作方法 (Transistor structure and manufacturing method ) 是由 陈宇怀 王宏煜 苏智昱 黄志杰 于 2020-04-16 设计创作，主要内容包括：一种晶体管结构及制作方法,其中结构包括第一金属层,所述第一金属层内图案化栅极与源漏极,图案化的栅极与源漏极处于同一水平位置,包括第一绝缘层,第一绝缘层包覆在图案化后的栅极层与源漏极层之上,第一绝缘层还包括通孔,第一绝缘层上还包括半导体层,所述半导体层在栅极层的竖直上方,半导体层上方还设置有第二绝缘层,第二绝缘层还包括过孔,第二绝缘层的上方还设置有第二金属层,所述第二金属层通过通孔及过孔连接栅极金属及源漏极金属走线。上述技术方案通过将栅极金属与源漏极金属合并在同一层,通过在第一金属层中进行图案化布线,以及其上的第二金属层通过通孔、过孔连接第一金属层的栅极和源漏极。从而达到制程中减少光罩数量的效果。(A transistor structure and a manufacturing method thereof are provided, wherein the structure comprises a first metal layer, a grid electrode and a source drain electrode are patterned in the first metal layer, the patterned grid electrode and the source drain electrode are in the same horizontal position, the transistor structure comprises a first insulating layer, the first insulating layer is coated on the patterned grid electrode layer and the source drain electrode layer, the first insulating layer further comprises a through hole, a semiconductor layer is further arranged on the first insulating layer, the semiconductor layer is vertically above the grid electrode layer, a second insulating layer is further arranged above the semiconductor layer, the second insulating layer further comprises a through hole, a second metal layer is further arranged above the second insulating layer, and the second metal layer is connected with grid metal and source drain electrode metal wiring through the through hole and the through hole. According to the technical scheme, the grid metal and the source drain metal are combined in the same layer, patterning wiring is carried out in the first metal layer, and the second metal layer on the grid metal and the source drain metal are connected with the grid electrode and the source drain electrode of the first metal layer through the through holes and the through holes. Thereby achieving the effect of reducing the number of photomasks in the manufacturing process.)

1. The utility model provides a transistor structure, its characterized in that includes first metal level, patterning grid and source drain in the first metal level, patterning grid and source drain are in same horizontal position, including the first insulating layer, the first insulating layer cladding is on patterning grid layer and source drain layer, and the first insulating layer still includes the through-hole, still includes semiconductor layer on the first insulating layer, semiconductor layer is in the vertical top of grid layer, and the semiconductor layer top still is provided with the second insulating layer, and the second insulating layer still includes the via hole, and the top of second insulating layer still is provided with the second metal level, the second metal level is walked through-hole and via hole connection grid metal and source drain metal.

2. The transistor structure of claim 1, wherein the second metal layer is a metal and ITO composite film layer.

3. The transistor structure of claim 1, wherein the first insulating layer is plated on the first metal layer.

4. A transistor manufacturing method is characterized by comprising the following steps of patterning a grid electrode and a source drain electrode in a first metal layer, enabling the grid electrode and the source drain electrode to be located at the same horizontal position, arranging a first insulating layer on the grid electrode and the source drain electrode, arranging a through hole at the position of the first insulating layer, arranging a semiconductor layer, enabling the semiconductor layer to be vertically above the grid electrode layer, arranging a second insulating layer above the semiconductor layer, arranging a through hole in the second insulating layer, arranging a second metal layer on the second insulating layer, and enabling the second metal layer to be connected with grid metal and source drain electrode metal wiring through the through hole and the through hole.

5. The method of claim 1, wherein the second metal layer is a metal and ITO composite film.

6. The method of claim 1, wherein the first insulating layer is plated on the first metal layer.

Technical Field

The invention relates to a design scheme of a thin film transistor, in particular to a transistor structure and a manufacturing method thereof, wherein the transistor structure can integrate a grid layer and a source drain layer so as to save a photomask process.

Background

The basic structure of a Thin Film Transistor (TFT) currently used in a display panel generally includes a first metal layer gate GE, a first insulating layer GI, a semiconductor active layer SE, a second metal layer source drain SD, a second insulating layer PV, and a pixel electrode PE, which are 6 masks in total. In order to improve the device stability, the designer may additionally add an etch stop layer ESL after SE patterning to protect it from additional damage during the SD process.

On the basis of the above, the TFT has derived many improvements, and additional layers are added to obtain other functions or improve the device performance. There are also reductions in the number of masks to reduce production costs and reduce fabrication time, most often the film with the ESL structure is removed to be BCE structure to reduce cost, but performance is usually degraded, or the number of masks is reduced by using the same mask or self-alignment, but the number of films is usually not changed.

Disclosure of Invention

Therefore, it is necessary to provide a new TFT process design to solve the problem of complex process in the prior art.

In order to achieve the above object, the present invention provides a transistor structure, including a first metal layer, a patterned gate and a source drain are arranged in the first metal layer, the patterned gate and the source drain are in the same horizontal position, the transistor structure includes a first insulating layer, the first insulating layer is coated on the patterned gate layer and the source drain, the first insulating layer further includes a through hole, the first insulating layer further includes a semiconductor layer, the semiconductor layer is vertically above the gate layer, a second insulating layer is further arranged above the semiconductor layer, the second insulating layer further includes a via hole, a second metal layer is further arranged above the second insulating layer, and the second metal layer is connected with a gate metal and a source drain metal wire through the through hole and the via hole.

Specifically, the second metal layer is a metal and ITO composite film layer.

Further, the first insulating layer plating film is on the first metal layer.

A transistor manufacturing method comprises the following steps of patterning a grid electrode and a source drain electrode in a first metal layer, enabling the grid electrode and the source drain electrode to be located at the same horizontal position, arranging a first insulating layer on the grid electrode and the source drain electrode, arranging a through hole in the first insulating layer, arranging a semiconductor layer, enabling the semiconductor layer to be vertically above the grid electrode layer, arranging a second insulating layer above the semiconductor layer, arranging a through hole in the second insulating layer, arranging a second metal layer on the second insulating layer, and enabling the second metal layer to be connected with grid electrode metal and source drain electrode metal wiring through the through hole and the through hole.

Specifically, the second metal layer is a metal and ITO composite film layer.

Further, the first insulating layer plating film is on the first metal layer.

Different from the prior art, the technical scheme combines the grid metal and the source drain metal in the same layer, and the second metal layer on the grid metal and the source drain metal are connected with the grid and the source drain of the first metal layer through the through holes and the through holes by carrying out patterned wiring in the first metal layer. Thereby achieving the effect of reducing the number of photomasks in the manufacturing process. The final aim is to save cost and reduce economic burden.

Drawings

FIG. 1 is a schematic diagram of a first metal layer according to one embodiment;

FIG. 2 is a schematic view of a first insulating layer GI according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a semiconductor layer SE according to an embodiment of the present invention;

FIG. 4 is a schematic view of a second insulating layer PV according to one embodiment;

FIG. 5 is a schematic diagram of a second metal layer according to one embodiment;

FIG. 6 is a schematic diagram of a first metal layer according to a second embodiment;

FIG. 7 is a schematic diagram of scheme two GI and SE according to the embodiment;

FIG. 8 is a schematic view of a second insulating layer PV according to an embodiment

Fig. 9 is a schematic diagram of a second metal layer according to a second embodiment of the present invention.

Detailed Description

To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.

Referring to fig. 1, a transistor structure includes a first metal layer, a gate GE and a source drain SD are patterned in the first metal layer, and due to the patterning of the metal layer of the same layer, the patterned gate and the source drain are at the same horizontal position. Referring to fig. 2, the first insulating layer GI may be coated on the patterned gate layer and the source/drain layer by evaporation or electroplating, which is not shown in the figure. Then, the first insulating layer further includes a via hole (circular portion DChole in the figure), and further, as shown in fig. 3, a semiconductor active layer SE, which may also be referred to as a semiconductor layer, may be further disposed on the first insulating layer GI. The part of the semiconductor layer vertically above the gate layer needs to be slightly wider than the gate trace, a second insulating layer PV is further disposed above the semiconductor layer shown in fig. 4, and the second insulating layer further includes a via hole (block part in the figure). As further shown in fig. 5, a second metal layer is further disposed above the second insulating layer, and the second metal layer is connected to the gate metal or the source/drain metal trace through the through hole and the via hole. The second metal layer is a metal and ITO composite film layer.

In the following we will describe in detail the structure of the first embodiment by way of example in fig. 1-5, fig. 1-5 being the first embodiment of the patent

Fig. 1 is a schematic diagram of patterning a first metal layer according to the first embodiment, in which a paper surface is parallel to a substrate plane. The film comprises a GE wiring and an SD wiring, wherein the GE and the SD are patterns etched from the same metal layer, and the wiring functions are only distinguished by different gray levels, wherein the patterns comprise a first source drain region SD1, a first gate region GE, a third source drain region and a second source drain region SD2 which are sequentially arranged along the longitudinal direction of a paper surface.

Fig. 2 is a first embodiment of the first insulating layer GI plating and patterning, that is, forming DC holes, which are indicated by black circles, and it can be seen that in the drawing, a first through hole and a second through hole are formed in a first source drain region and a second source drain region, respectively, and a third through hole and a fourth through hole are formed in a third source drain region. The film layer can use SiOx, SiNx, AlOx or other insulating substances and composite film layers thereof as insulating layers.

Fig. 3 shows the SE coating and patterning of the semiconductor active layer according to the first embodiment, wherein the SE width on GE should cover the underlying GE, and a-Si, MOS (metal oxide semiconductor), LTPS, etc. can be used as the active layer. The semiconductor active layer in the source and drain region covers the second through hole and the third through hole.

Fig. 4 is a first alternative of coating and patterning a second insulating layer PV, shown as a black rectangle and square, and opening the corresponding PV locations to ensure that the second metal layer contacts the first metal layer or the active layer, specifically, the via holes in the second insulating layer include a first via hole communicating the first via hole with the semiconductor layer on the gate region; and a second via on the semiconductor layer on the gate region; and the third through hole is communicated with the fourth through hole. SiOx, SiNx, AlOx, organic films or other insulating materials and composite films thereof can be used as the insulating layer of the film.

Fig. 5 is a first embodiment of the second metal layer PE coating and patterning, which includes bridging traces, capacitors, and pixel electrode portions, and the coating is typically ITO or a composite coating of metal and ITO or other metals and alloys. As shown in the right-hand translucent structure of fig. 5: a is a pixel electrode part, and the partial film layer is communicated with the third through hole and covers the first source drain region and the first gate region; b is a bottom gate structure TFT1, the partial film layer covering the first via. A PE electrode connected to an SD1 (first source drain region) line and TFT2 and capacitor through a PV via (first via) and a DC via (first via), respectively; c is a capacitor, the partial film layer covers the second source drain region and the second through hole, and simultaneously covers the semiconductor active layer which covers the second through hole and the third through hole and is arranged in the source drain region, and the dielectric film layer is GI and PV; d is the top gate structure TFT2, i.e., the semiconductor active layer in the source and drain regions as described above. The GE is PE film metal, and the source and drain electrodes are connected with the SD2 wiring and connected to the pixel electrode through the SD2 bridging wiring.

In the following, we will describe the structure of the second embodiment in detail by way of example in fig. 6-9, and fig. 6-9 are the second embodiment of this patent

Fig. 6 is a schematic diagram of patterning the first metal layer in the second scheme, where the first metal layer includes a GE trace and an SD trace, GE and SD are patterns etched from the same metal layer, and the trace functions are distinguished only by different gray scales, where the first metal layer includes a first source/drain region SD1, a first gate region GE1, a second gate region GE2, and a second source/drain region SD2, which are sequentially arranged along the longitudinal direction of the paper. The film can use Mo, Al, Ti, Cu, Ag, W and other metals or composite film metals thereof.

Fig. 7 shows a first insulating layer GI according to a second embodiment, which is also formed on the gate region and the source/drain regions. SE is now patterned, with the SE width over GE covering the underlying GE, which can be seen to include a first semiconductor region on a first gate region and a second semiconductor region on a second gate region. The GI film may be SiOx, SiNx, AlOx, or other insulating materials or combinations thereof, and the SE film may be a-Si, MOS, LTPS, or the like, as an active layer. As can also be seen from the figure, the through holes of the first insulating layer include a first through hole on the first source-drain region, a second through hole on the second gate region, and a third through hole and a fourth through hole on the second source-drain region.

Fig. 8 is a second embodiment of the second insulating layer PV coating and patterning, which is represented by black rectangles and squares, and holes are formed at corresponding positions of the PV to ensure that the second metal layer can contact the first metal layer or the active layer, and the second metal layer may be SiOx, SiNx, AlOx, an organic film layer or other insulating material or a composite film layer thereof as an insulating layer. As can be seen from the figure, the via holes on the second insulating layer include a first via hole communicating with the first source-drain region and the first semiconductor region, a second via hole communicating with the first semiconductor region and the first gate region, a third via hole and a fourth via hole on the second semiconductor region; and a fifth via hole and a sixth via hole on the second source drain region. The first through hole covers the first through hole, the second through hole covers the second through hole, the fifth through hole covers the third through hole, and the sixth through hole covers the fourth through hole, so that the first layer of metal and the semiconductor layer are exposed.

Fig. 9 is a second embodiment of the second metal layer PE coating and patterning, which includes bridging traces, capacitors and pixel electrode portions, and the coating is typically ITO or a composite coating of metal and ITO or other metals and alloys. As shown in the right-hand translucent structure of fig. 9: a is a pixel electrode part, and the partial film layer covers the first source drain region, the second source drain region and the third via hole on the second semiconductor region; b is a bottom gate structure TFT1 which is respectively connected to the SD1 line, the TFT2 and the GE electrode of the capacitor through a PV hole, wherein the PE film layer comprises one area covering the first via hole and the other area covering the second via hole; c is a capacitor, the metal film layers of the capacitor are GE and PE respectively, the PE electrode is connected to the SD2 wire through the PV hole, the PE film layer covers the second gate region and the sixth via hole, and the dielectric film layers are GI and PV; d is a bottom gate structure TFT2, and the source and drain electrodes are connected with the SD2 wiring and the pixel electrode, so that the structure also comprises a PE film layer covering the fourth via hole and the fifth via hole.

Through the design, the structure forms the routing in a bridging mode by the semiconductor active layer and the second metal layer, and a metal film layer can be omitted compared with the traditional TFT, so that the required number of photomasks and the required processing time can be reduced, the number of basic photomasks required by the first scheme is 5, and the number of basic photomasks required by the second scheme is 4.

The film layers formed in front of and behind the semiconductor active layer SE are insulating layers, so that the number of photomasks can be reduced compared with the common BCE structure, and the insulating layers can play a role similar to ESL (electronic shelf label) in protecting the SE from being etched and damaged by the metal film layers.

The design can be suitable for the design of combining a plurality of TFTs and capacitors, the design of driving a single TFT is compatible, and the first scheme is also compatible with a method for implementing a top gate structure and a bottom gate structure.

The design has 2 layers of main conductive traces, so that the influence of electrodes other than GE and SD on SE does not need to be considered.

e. By adjusting the material and the structure of the pixel electrode film layer, the design can be compatible with panels of LCD, OLED, QLED and the like. The PE film layer only uses ITO, and the main display area is outside the metal wiring, so that the PE film layer can be suitable for backlight luminescent display panels, such as LCDs, light-excited OLEDs, QLEDs and the like; when the PE film layer uses a metal and ITO composite film layer, the pixel electrode has better reflectivity, so the film can be suitable for self-luminous OLED, QLED and other display devices or used as an induction TFT.

A transistor manufacturing method comprises the following steps of patterning a grid electrode and a source drain electrode in a first metal layer, enabling the grid electrode and the source drain electrode to be located at the same horizontal position, arranging a first insulating layer on the grid electrode and the source drain electrode, arranging a through hole in the first insulating layer, arranging a semiconductor layer, enabling the semiconductor layer to be vertically above the grid electrode layer, arranging a second insulating layer above the semiconductor layer, arranging a through hole in the second insulating layer, arranging a second metal layer on the second insulating layer, and enabling the second metal layer to be connected with grid electrode metal and source drain electrode metal wiring through the through hole and the through hole.

Specifically, the second metal layer is a metal and ITO composite film layer.

Further, the first insulating layer plating film is on the first metal layer.

It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present invention.