Patent ID: 8614469

Claim:
A semiconductor device including a MISFET, comprising: a gate electrode of the MISFET formed over a semiconductor substrate; a first insulating film formed on the semiconductor substrate and formed on a side surface of the gate electrode; a second insulating film formed on the semiconductor substrate and formed on the side surface of the gate electrode via the first insulating film; and a third insulating film formed on the semiconductor substrate via the second insulating film and formed on the side surface of the gate electrode via the first and second insulating films, wherein a height of the second insulating film is smaller than a height of the first insulating film and is larger than a height of the third insulating film, wherein a height of the gate electrode is larger than the height of the first insulating film, wherein the third insulating film is made of a silicon nitride film, wherein the second insulating film is made of a silicon oxide film, and wherein the first insulating film is made of a silicon oxide film.