Patent ID: 9722095
Date: 2017-08-01
CPC Classifications: H01L

Claim:
1. A semiconductor device comprising: an oxide insulating film; an oxide semiconductor film over the oxide insulating film, the oxide semiconductor film comprising a first region and a second region; a source electrode and a drain electrode in contact with the oxide semiconductor film; a gate insulating film between the source electrode and the drain electrode; a gate electrode overlapping the oxide semiconductor film with the gate insulating film therebetween; and a nitride insulating film overlapping the first region with the gate insulating film therebetween, wherein the nitride insulating film is on and in contact with the gate electrode, the source electrode and the drain electrode, wherein the first region and the gate electrode overlap each other, wherein the nitride insulating film is in contact with the second region, wherein a concentration of an impurity element of the first region and a concentration of the impurity element of the second region are different, and wherein the gate electrode, the source electrode, and the drain electrode comprise the same metal element.