Patent ID: 6967379

Claim:
A semiconductor device comprising: a semiconductor substrate; an N-channel MISFET and a P-channel MISFET provided on the semiconductor substrate, each of the N- and P-channel MISFETs being isolated by an isolation region and having a gate insulating film; a first gate electrode film provided on the gate insulating film of the N-channel MISFET, the first gate electrode film being comprised of a first metal silicide composed of a first metal material; a second gate electrode film provided on the gate insulating film of the P-channel MISFET, the second gate electrode film being comprised of a second metal silicide and a third metal silicide, the second metal silicide being comprised of a second metal material different from the first metal material, the third metal silicide including the first metal material and having a lower silicon content than the first metal silicide; and the first gate electrode film having a work function being lower than that of the second gate electrode film.