Patent ID: 7238996

Claim:
A semiconductor device, comprising: a semiconductor substrate; an N-type MOSFET including: a first gate insulating film, formed on said semiconductor substrate, and composed of a first high dielectric constant film including one or more metallic element(s) selected from a group consisting of Hf and Zr; and a first gate electrode, disposed on said first gate insulating film to contact with said first high dielectric constant film, and composed of a polycrystalline silicon film; and a P-type MOSFET including: a second gate insulating film, formed on said semiconductor substrate to be juxtaposed to said N-type MOSFET, and composed of a second high dielectric constant film containing one or more metallic element (s) selected from a group consisting of Hf and Zr; and a second gate electrode, disposed on said second gate insulating film to contact with said second high dielectric constant film, and composed of a polycrystalline silicon film, wherein a concentration of said metallic element in said second high dielectric constant film is lower than a concentration of said metallic element in said first high dielectric constant film.