Patent ID: 9293590
Filing Date: 2016-03-22
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: a base insulating film; a first metal oxide film over the base insulating film; a source electrode and a drain electrode which are in contact with the first metal oxide film; a gate insulating film over the first metal oxide film, the source electrode, and the drain electrode; and a gate electrode provided over the first metal oxide film with the gate insulating film interposed therebetween, wherein the gate insulating film comprises a first insulating film, a second metal oxide film, and a second insulating film, wherein the first insulating film is in contact with the first metal oxide film, wherein the second metal oxide film is sandwiched by the first insulating film and the second insulating film, and wherein all elements contained in the first metal oxide film are the same as all elements contained in the second metal oxide film.