Patent ID: 9553198
Date: 2017-01-24
CPC Classifications: H01L

Claim:
1. A thin-film transistor (TFT) substrate structure, comprising a base plate, a gate terminal formed on the base plate, a gate insulation layer formed on the base plate and covering the gate terminal, an island-like semiconductor layer formed on the gate insulation layer to be located above and corresponding to the gate terminal, and a source terminal and a drain terminal formed on the gate insulation layer to respectively contact two side portions of the island-like semiconductor layer, wherein the island-like semiconductor layer comprises, stacked from bottom to top, an amorphous silicon layer, an N-type lightly-doped amorphous silicon layer, and an N-type heavily-doped amorphous silicon layer, the island-like semiconductor layer comprising a U-shaped trough formed therein in such a way that the U-shaped trough extends completely through the N-type lightly-doped amorphous silicon layer and the N-type heavily-doped amorphous silicon layer so as to divide the N-type heavily-doped amorphous silicon layer into first and second N-type heavily-doped amorphous silicon layers respectively on two sides of the U-shaped trough and to divide the N-type lightly-doped amorphous silicon layer into first and second N-type lightly-doped amorphous silicon layers respectively on the two sides of the U-shaped trough and also to form a channel in the amorphous silicon layer at a location under and corresponding to the U-shaped trough; and the source terminal and the drain terminal are respectively in contact with surfaces of the first and second N-type heavily-doped amorphous silicon layers.