Patent ID: 8551832

Claim:
A method for manufacturing a semiconductor device comprising: forming a first-conductivity-type well of a first conductivity type and a second-conductivity-type well of a conductivity type opposite to the first conductivity type in a silicon substrate; stacking a first high-dielectric-constant insulating film and a first cap dielectric film above the silicon substrate; removing at least the first cap dielectric film from above the second-conductivity-type well; conducting a first annealing at a first temperature to cause an element included in the first cap dielectric film to diffuse into the first high-dielectric-constant insulating film disposed above the first-conductivity-type well; after said stacking the first high-dielectric-constant insulating film and the first cap dielectric film and after the first annealing, stacking a second high-dielectric-constant insulating film and a second cap dielectric film above the silicon substrate; removing the second cap dielectric film disposed above the first-conductivity-type well; and conducting a second annealing at a second temperature lower than the first temperature to cause an element included in the second cap dielectric film to diffuse into the second high-dielectric-constant insulating film disposed above the second-conductivity-type well.