Patent ID: 9269825
Filing Date: 2016-02-23
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: an oxide semiconductor film over an oxide insulating layer; a gate insulating film over the oxide semiconductor film; a gate electrode layer over the gate insulating film, wherein the gate electrode layer overlaps with the oxide semiconductor film; and an insulating layer over the oxide semiconductor film and the gate electrode layer, wherein the insulating layer comprises an aluminum oxide film, wherein an average surface roughness of the oxide insulating layer is less than or equal to 0.15 nm, wherein the oxide semiconductor film comprises indium, gallium, zinc, and oxygen, and an atomic percentage of the indium is twice or more as large as each of an atomic percentage of the gallium and an atomic percentage of the zinc, and wherein a region of the oxide semiconductor film which does not overlap with the gate electrode layer includes a dopant.