Patent ID: 7989295
Filing Date: 2011-08-02
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising the processes of: preparing a semiconductor substrate made of a semiconductor material; forming a hetero semiconductor region on the semiconductor substrate in order to form a heterojunction in an interface between the hetero semiconductor region and the semiconductor substrate, the hetero semiconductor region being made of a semiconductor material (called a hetero semiconductor material, below) having a bandgap which is different from that of the semiconductor material; forming any one of a part and all of a gate insulating film adjacent to the heterojunction by oxidizing at least a part of the hetero semiconductor region; and forming a gate electrode on the gate insulating film, wherein a part of the hetero semiconductor region includes a film thickness control portion, whose film thickness is thinner than that of the other part of the hetero semiconductor region, and the gate insulating film is formed by oxidizing the film thickness control portion, wherein the process of forming the hetero semiconductor region on the semiconductor substrate includes the processes of: