Patent ID: 7867856
Filing Date: 2011-01-11
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor substrate comprising steps of: forming a mask layer on a semiconductor substrate, the mask layer covering up a region to serve as an active region and including an opening for exposing a region to serve as an STI region; forming a trench for the STI region using the mask layer; forming a first insulating film in the trench and in the opening of the mask layer without removing the mask layer; forming a second opening corresponding to the mask layer in the first insulating film by selectively removing the mask layer; forming a sidewall insulating film on an inner wall of the second opening; forming a second insulating film in the second opening in which the sidewall insulating film is formed; selectively removing the sidewall insulating film in a region in which a gate electrode is to be formed; forming two trenches in the region in which the gate electrode is to be formed on the semiconductor substrate using the first insulating film and the second insulating film as a mask, and forming a fin-shaped part which is located between the two gate trenches, which is a part of the semiconductor substrate, and which is to serve as a channel region; forming a gate insulating film at least on an upper surface and a side surface of the fin-shaped part; and forming the gate electrode buried in the two gate trenches and covering up the fin-shaped part.