Patent ID: 9142648
Filing Date: 2015-09-22
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising the steps of: forming a gate electrode layer over a substrate; forming a gate insulating layer over the gate electrode layer; forming a stacked oxide semiconductor film over the gate insulating layer, the stacked oxide semiconductor film comprising a first oxide semiconductor film and a second oxide semiconductor film over the first oxide semiconductor film; performing oxygen doping treatment on the stacked oxide semiconductor film; and forming a source electrode layer and a drain electrode layer over the stacked oxide semiconductor film, wherein each of the first oxide semiconductor film and the second oxide semiconductor film contains indium, wherein the first oxide semiconductor film includes crystals which are c-axis aligned perpendicularly to a surface of the first oxide semiconductor film, and wherein the second oxide semiconductor film includes crystals which are c-axis aligned perpendicularly to a surface of the second oxide semiconductor film.