Patent ID: 7265428

Claim:
A semiconductor device comprising: a silicon substrate; and a CMOSFET on said silicon substrate and including an NMOSFET and a PMOSFET, wherein a gate dielectric film of said NMOSFET and a gate dielectric film of said PMOSFET each have a laminated structure including a first dielectric film and a second dielectric film, said first dielectric film being on said silicon substrate, and said second dielectric film being on said first dielectric film; a gate electrode of said NMOSFET includes an n-type silicon film and a first metal silicide film, said n-type silicon film being on said gate dielectric film of said NMOSFET and being in contact with said gate dielectric film of said NMOSFET, and said first metal silicide film being on said n-type silicon film; a gate electrode of said PMOSFET includes a second metal silicide film directly in contact with said gate dielectric film of said PMOSFET; and said second dielectric film is a high dielectric constant dielectric film and is not on sidewalls of said gate electrodes of said NMOSFET and said PMOSFET.