Patent ID: 7422947

Claim:
A method of manufacturing a semiconductor device, comprising: depositing a semiconductor layer and mask material in order over a semiconductor substrate on an insulating film; patterning the semiconductor layer and mask material to form a semiconductor layer in a predetermined region; removing a surface portion of the insulating film by a predetermined depth by performing etching by using the mask material as a mask; forming gate insulating films on at least a pair of opposing side surfaces of the semiconductor layer; depositing silicon on the insulating film, gate insulating films, and mask material; patterning the silicon into a gate pattern to form, on the gate insulating films, a silicon film having the gate pattern on predetermined regions of the pair of opposing side surfaces of the semiconductor layer; ion-implanting a predetermined impurity into the semiconductor layer by using the silicon film as a mask, thereby forming a source region and drain region in two end portions of the semiconductor layer where the silicon film is not formed; and forming a metal film by depositing a metal on at least the silicon film, and forming a gate electrode by reacting the silicon film with the metal film.