Patent ID: 7994585

Claim:
A semiconductor device comprising: a semiconductor layer; an element separating portion, formed in a top layer portion of the semiconductor layer and separating, in the semiconductor layer, a first element forming region for forming a first conductive type MOSFET and a second element forming region for forming a second conductive type MOSFET; a first gate insulating film, selectively formed on a top surface of the semiconductor layer in the first element forming region; a first gate electrode, formed on the first gate insulating film; a first sidewall, formed at a periphery of the first gate insulating film and the first gate electrode, the first sidewall including a base, contacting a top surface of the semiconductor layer, and a main body, formed on the base and expanded laterally beyond a peripheral edge of the base; a second gate insulating film, selectively formed on a top surface of the semiconductor layer in the second element forming region; a second gate electrode, formed on the second gate insulating film; a second sidewall, formed at a periphery of the second gate insulating film and the second gate electrode; and a tensile stress film for applying a tensile stress to a channel region in the top layer portion of the semiconductor layer opposing the second gate insulating film, the tensile stress film disposed on the semiconductor layer, the first gate electrode, and the second gate electrode, the tensile stress film being interrupted at a portion opposing the base of the first sidewall.