Polycrystalline SiTFT of multi-grid double-channel structure
A polysilicon thin film, dual-channel technology, applied in transistors and other directions, can solve problems such as increasing the aspect ratio
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[0047] Preparation Example 1:
[0048] 1) Firstly, PECVD method is used on the silicon substrate to obtain 5000 SiO under the condition of 300 ℃ 2 .
[0049] 2) Use LPCVD method (pressure 0.3 Torr, SiH 4 60sccm, the speed is 25 per second) 2000 a-Si (amorphous silicon, with SiH 4 Used as a gas source to decompose to obtain a-Si, the substrate temperature during deposition is 200℃, and the background vacuum is 2×10 -4 Pa, reaction chamber pressure 80Pa) and ion implantation doping (energy 45KeV, concentration 5×10 15 cm -2 ), then use plasma etching process (dry etching) to lithography such as figure 2 The pattern shown forms a bottom gate 23;
[0050] 3) Precipitating 2500 SiNx as the insulating layer of the bottom gate, the growth of this layer of film also uses PECVD in SiH 4 And NH 3 Grow in a mixed atmosphere with a substrate temperature of 270°C and a reaction chamber pressure of 30Pa;
[0051] 4) Using LPCVD technology to deposit 500 a-Si film, the conditions are ...
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