Patent ID: 8143676

Claim:
A semiconductor device comprising: a substrate having first and second regions on a surface thereof; a first conductivity type first MISFET formed in the first region and including: a silicon oxide film or a silicon oxynitride film formed on the surface of the substrate, and a first insulating film which is formed in contact with the silicon oxide film or the silicon oxynitride film and which has a first element forming electric dipoles that reduce a threshold voltage of the first MISFET; and a second conductivity type second MISFET formed in the second region and including: a silicon oxide film or a silicon oxynitride film formed on the surface of the substrate, a second insulating film which is formed in contact with the silicon oxide film or the silicon oxynitride film formed on the surface of the substrate and which has a second element forming electric dipoles in a direction opposite to that in the first MISFET, and a third insulating film which is formed above the silicon oxide film or the silicon oxynitride film so as to come in contact with the second insulating film and has the same composition as the first element, wherein the second element contains aluminum.