Patent ID: 9087745
Filing Date: 2015-07-21
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device comprising the steps of: forming an insulating film comprising silicon and excessive oxygen; forming an oxide semiconductor film in contact with the insulating film, the oxide semiconductor film including a channel formation region; forming a conductive film over the oxide semiconductor film; selectively etching the conductive film to form a source electrode and a drain electrode, treating an upper surface of the oxide semiconductor film with a plasma of gas containing oxygen without applying a bias; forming an insulating film on the oxide semiconductor film after treating the upper surface of the oxide semiconductor film; and forming a gate electrode adjacent to the oxide semiconductor film, wherein the step of treating the upper surface of the oxide semiconductor film with the plasma of gas containing oxygen is performed after selectively etching the conductive film, and wherein the oxide semiconductor film comprises indium, gallium, and zinc.