Patent ID: 9711625
Date: 2017-07-18
CPC Classifications: H01L

Claim:
1. A method for manufacturing a thin-film transistor, comprising: providing a substrate; forming a first metal layer on the substrate and applying pattern formation operation to form the first metal layer into a pattern including a gate; forming a gate insulation layer on the substrate and the first metal layer in such a way that the gate insulation layer covers a surface of the substrate and the first metal layer; forming an oxide semiconductor layer, of which an orthogonal projection is cast on the gate, on the gate insulation layer within a thin-film transistor area and an etch stop layer on the oxide semiconductor layer, wherein the oxide semiconductor layer has an edge portion that is exposed outside the etch stop layer, comprising the following sub-steps: coating an oxide semiconductor coating layer and an etch stop coating layer on the gate insulation layer of the substrate in such a way that the etch stop coating layer is stacked on the oxide semiconductor coating layer; applying pattern formation operations to simultaneously patternize the oxide semiconductor coating layer and the etch stop coating layer so as to form a patternized oxide semiconductor layer and a patternized etch stop layer on the thin-film transistor area of the substrate; and then, applying two etching operations, which includes a first etching operation and a second etching operation, to the patternized oxide semiconductor layer and etch stop layer such that the first etching operation etch the pattenized oxide semiconductor layer and the patternized etch stop layer to form the oxide semiconductor layer and the etch stop layer having the same size cast an identical projection on the gate; forming a second metal layer on the thin-film transistor area and an exposed portion of the gate insulation layer and patternizing the second metal layer to form a source and a drain of the thin-film transistor, wherein the source and the drain are both connected to the oxide semiconductor layer; forming an insulation protection layer on the substrate and the patternized second metal layer and patternizing the insulation protection layer; and forming a patternized pixel electrode on the insulation protection layer at a location, which after patternization is distant from the thin-film transistor area, in such a way that the pixel electrode is connected to the drain.