Patent ID: 8723176
Filing Date: 2014-05-13
Classification: H01L

Abstract:
1. A semiconductor device comprising: an island-like semiconductor film comprising: an oxide film adjacent to the second oxide semiconductor film interposed between the first oxide semiconductor film and the oxide film, wherein the oxide film comprises a c-axis aligned crystal part; a gate electrode adjacent to the oxide film interposed between the island-like semiconductor film and the gate electrode; and a source electrode and a drain electrode electrically connected to the island-like semiconductor film, wherein the first oxide semiconductor film, the second oxide semiconductor film, and the oxide film each include an oxide containing indium, gallium, and zinc, wherein an indium content in the second oxide semiconductor film is higher than an indium content in the first oxide semiconductor film, wherein the indium content in the first oxide semiconductor film is higher than an indium content in the oxide film, wherein a gallium content in the oxide film is higher than a gallium content in the first oxide semiconductor film, and wherein the gallium content in the first oxide semiconductor film is higher than a gallium content in the second oxide semiconductor film.