Patent ID: 9040396
Filing Date: 2015-05-26
Classification: H01L

Abstract:
1. A manufacturing method of a semiconductor device comprising: forming an oxide semiconductor layer wherein the oxide semiconductor layer comprises an oxide including crystals having c-axis alignment; forming a protective conductive film over the oxide semiconductor layer; forming a conductive film over the protective conductive film; selectively etching the conductive film under a condition that a first etching selectivity of the conductive film to the protective conductive film is greater than 1, so that the protective conductive film is exposed; selectively etching the protective conductive film under a condition that a second etching selectivity of the protective conductive film to the oxide semiconductor layer is greater than 1, so that the oxide semiconductor layer is exposed; forming a gate insulating layer over the oxide semiconductor layer; and forming a gate electrode layer over the gate insulating layer to overlap with the oxide semiconductor layer.