Patent ID: 8018004

Claim:
A semiconductor device comprising: a first MIS transistor; and a second MIS transistor, wherein the first MIS transistor includes: a first active region surrounded by an isolation region in a semiconductor substrate; a first gate insulating film formed on the first active region; and a first gate electrode including a first metal film formed on the first gate insulating film, and a first silicon film formed directly on the first metal film, the second MIS transistor includes: a second active region surrounded by the isolation region in the semiconductor substrate; a second gate insulating film formed on the second active region and made of an insulating material different from that of the first gate insulating film; and a second gate electrode including a second metal film formed on the second gate insulating film, and a second silicon film formed directly on the second metal film, the isolation region has an isolation part located between the first active region and the second active region adjacent to each other along a gate width direction, the first gate electrode and the second gate electrode extend on the isolation part, the first gate electrode and the second gate electrode have opposing surfaces facing each other on the isolation part, a part of the opposing surface located in the first silicon film and a part of the opposing surface located in the second silicon film are connected to each other so that the first silicon film and the second silicon film are integrally formed with each other, and a part of the opposing surface located in the first metal film and a part of the opposing surface located in the second metal film are separated from each other with a sidewall insulating film interposed therebetween, the sidewall insulating film being integrally formed with the first gate insulating film, and being formed on the isolation part.