Patent ID: 9425322
Filing Date: 2016-08-23
CPC Classification: H01L

Claim Text:
1. A method for manufacturing a semiconductor device, comprising the steps of: forming a first oxide semiconductor film containing indium over an insulating surface; exposing the first oxide semiconductor film to a reducing atmosphere; forming a gate insulating film over the first oxide semiconductor film after exposing the first oxide semiconductor film; forming a gate electrode over the first oxide semiconductor film with the gate insulating film interposed therebetween; and forming source and drain electrodes electrically connected to the first oxide semiconductor film, wherein the source and drain electrodes are provided between the first oxide semiconductor film and the gate insulating film, wherein a first region and a second region in contact with a top surface of the first region are formed in the first oxide semiconductor film by exposing the first oxide semiconductor film to the reducing atmosphere, wherein the second region is a region exposed to the reducing atmosphere, and wherein a concentration of indium in the second region is lower than a concentration of indium in the first region.