Patent ID: 9006733
Filing Date: 2015-04-14
Classification: H01L

Abstract:
1. A semiconductor device comprising: an oxide semiconductor film provided over an oxide insulating film and including a channel formation region; a gate insulating film over the oxide semiconductor film; a gate electrode layer over the gate insulating film; a sidewall insulating layer including a first insulating film and a second insulating film; a third insulating film over and in contact with the gate electrode layer; and a source electrode layer and a drain electrode layer which are electrically connected to the oxide semiconductor film, wherein the sidewall insulating layer has an oxygen-excess region, wherein the first insulating film is in contact with a part of a top surface of the gate insulating film and side surfaces of the gate electrode layer and the third insulating film, and wherein the second insulating film is in contact with a top surface and a side surface of the first insulating film.