Patent ID: 7902025
Filing Date: 2011-03-08
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 hetero semiconductor material having a bandgap which is different from that of the semiconductor material; forming at least a part 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, the gate insulating film is formed by oxidizing the film thickness control portion, the process of forming the hetero semiconductor region on the semiconductor substrate includes the processes of: forming a first hetero semiconductor layer made of the hetero semiconductor material on the semiconductor substrate; selectively removing a part of the first hetero semiconductor layer so as to expose a part of the semiconductor substrate; and forming a second hetero semiconductor layer made of the hetero semiconductor material on at least the exposed part of the semiconductor substrate with a thickness equal to the film thickness of the film thickness control portion.