Patent ID: 8258582

Claim:
A semiconductor device comprising: a first transistor of a first conductivity type; and a second transistor of a second conductivity type, wherein the first transistor includes a first gate insulating film formed on a first active region of a semiconductor region and containing a high-k material and a first metal, and a first gate electrode including a lower conductive film formed on the first gate insulating film, a first conductive film formed on the lower conductive film, and a first silicon film formed on the first conductive film, the second transistor includes a second gate insulating film formed on a second active region of the semiconductor region and containing the high-k material and a second metal, and a second gate electrode including a second conductive film formed on and in contact with the second gate insulating film and made of the same material as the first conductive film, and a second silicon film formed on the second conductive film.