Patent ID: 7911007

Claim:
A semiconductor device comprising: a silicon substrate; a P type channel field effect transistor comprising a first gate insulating film on the silicon substrate, a first gate electrode on the first gate insulating film, and source/drain regions formed in the substrate on opposite sides of the first gate electrode; and an N type channel field effect transistor including a second gate insulating film on the silicon substrate, a second gate electrode on the second gate insulating film, and source/drain regions formed in the substrate on opposite sides of the second gate electrode, wherein in the P type channel field effect transistor, the first gate insulating film comprises a silicide oxide layer or a silicon oxynitride layer at least in a portion of the first gate insulating film, the portion including an upper surface thereof, the first gate electrode comprises a silicide layer containing a first-conductivity-type impurity element and an Ni 3 Si crystal phase, at least in a portion of the gate electrode, the portion including a lower surface thereof, and the P type channel field effect transistor comprises an adhesion layer containing a metal oxide component, between the first gate insulating film and the first gate electrode, and in the N type channel field effect transistor, the second gate insulating film comprises a silicide oxide layer or a silicon oxynitride layer at least in a portion of the second gate insulating film, the portion including an upper surface thereof, the second gate electrode comprises a silicide layer containing a second conductivity type impurity element and an Ni 3 Si crystal phase, at least in a portion of the gate electrode, the portion including a lower surface thereof, and the N type channel field effect transistor comprises an adhesion layer containing a metal oxide component, between the second gate insulating film and the second gate electrode.