Patent ID: 9570484
Date: 2017-02-14
CPC Classifications: H01L

Claim:
1. A method for manufacturing a semiconductor device, comprising the steps of: forming a gate electrode over a substrate; forming a gate insulating layer over the gate electrode; forming an oxide semiconductor layer over the gate insulating layer; performing heat treatment on the oxide semiconductor layer; forming a source electrode and a drain electrode over the oxide semiconductor layer after the heat treatment; forming a resist mask over the oxide semiconductor layer; performing etching on the oxide semiconductor layer using the resist mask; and forming an insulating layer so as to cover the oxide semiconductor layer, the source electrode, and the drain electrode after performing the etching, wherein the resist mask overlaps with the gate electrode, the source electrode and the drain electrode, and wherein part of the source electrode and part of the drain electrode, the part not overlapping with the resist mask, are also used as masks for the etching.