Patent ID: 7741180

Claim:
A method of manufacturing a semiconductor device, comprising: forming recess in a semiconductor layer of a first conductivity type; forming a gate insulating film in said recess, and a gate electrode structure over said gate insulating film, the gate electrode structure filling the recess and protruding from a surface of the semiconductor layer; forming a sidewall insulating film on a side surface of the gate electrode structure; introducing an impurity indicative of a second conductivity conductivity type by using the sidewall insulating film as a part of a mask, to form an impurity region of the second conductivity type in the semiconductor layer; forming an inter-layer insulating film on the gate electrode structure and the sidewall insulating film; and forming a contact hole in the inter-layer insulating film to expose a part of the sidewall insulating film, wherein said implanting said impurity indicative of the second conductivity type is performed after said forming said contact hole, and wherein said implanting said impurity indicative of the second conductivity type comprises using the inter-layer insulating film as another part of the mask.