Patent ID: 7528450

Claim:
A semiconductor device comprising: a silicon substrate; and a CMOSFET formed on said silicon substrate and made up of 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 insulating film and a second insulating film, said first insulating film being formed on said silicon substrate, said second insulating film being formed on said first insulating film; wherein a gate electrode of said NMOSFET includes an n-type silicon film and a first metal silicide film, said n-type silicon film being formed on said gate dielectric film of said NMOSFET, said first metal silicide film being formed on said n-type silicon film; wherein a gate electrode of said PMOSFET has a laminated structure including a metal film and a second metal silicide film, said metal film being formed on said gate dielectric film of said PMOSFET, said second metal silicide film being formed on said metal film, a material of said metal film being different from a material of said n-type silicon film; and wherein said second insulating film is a high dielectric constant insulating film and is not formed on sidewalls of said gate electrodes of said NMOSFET and said PMOSFET.