Patent ID: 8343817
Filing Date: 2013-01-01
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device comprising: forming a gate electrode layer over a substrate; forming a gate insulating film comprising silicon oxide over the gate electrode layer; forming an oxide semiconductor film containing indium and zinc over the gate insulating film; forming a second insulating film comprising silicon oxide over the oxide semiconductor film; forming a channel protective layer over a channel formation region of the oxide semiconductor film by selectively etching the second insulating film; forming a film having n-type conductivity over the oxide semiconductor film; forming a conductive film over the film having n-type conductivity; forming a resist mask over the conductive film; and etching the conductive film, the film having n-type conductivity, and the oxide semiconductor film using the resist mask formed over the conductive film formed over the film having n-type conductivity formed over the channel protective layer to form source and drain electrode layers and a semiconductor layer, wherein each of the gate insulating film, the oxide semiconductor film and the second insulating film is formed by sputtering in an atmosphere containing oxygen at 90% or more.