Patent ID: 9099562
Filing Date: 2015-08-04
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device comprising the steps of: forming a gate electrode over a substrate; forming a first insulating film over the gate electrode by using SiH forming a second insulating film over the first insulating film by using SiH forming an oxide semiconductor film over the gate electrode with the first insulating film and the second insulating film interposed therebetween, the oxide semiconductor film including a channel formation region; forming a source electrode and a drain electrode over the oxide semiconductor film, wherein part of the oxide semiconductor film between the source electrode and the drain electrode is etched, wherein each of the source electrode and the drain electrode comprises a tungsten layer; forming a protective film comprising silicon oxide over the oxide semiconductor film, the source electrode and the drain electrode; and forming a third insulating film over the oxide semiconductor film and the protective film, the second insulating film comprising silicon and nitrogen, wherein the oxide semiconductor film comprises gallium, zinc and indium.