Patent ID: 9330909
Filing Date: 2016-05-03
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: an oxide insulating film; an oxide semiconductor layer over the oxide insulating film; a first source electrode layer and a first drain electrode layer on and in contact with the oxide semiconductor layer; a second source electrode layer and a second drain electrode layer covering the first source electrode layer and the first drain electrode layer, respectively, and being in direct contact with the oxide semiconductor layer; a gate insulating film over the oxide insulating film, the oxide semiconductor layer, the second source electrode layer, and the second drain electrode layer; a gate electrode layer over the gate insulating film and overlapping with the oxide semiconductor layer; and a protective insulating film over the gate insulating film and the gate electrode layer, wherein the gate insulating film is partly in contact with the oxide insulating film in a region exterior to the second source electrode layer and the second drain electrode layer.