Patent ID: 7098120

Claim:
A method of manufacturing semiconductor devices, comprising: forming element isolation regions in a semiconductor substrate; forming a gate insulation film in an element region surrounded by said element isolation regions; forming an impurity doped metal silicide film on said gate insulation film; irradiating primarily visible light beams to heat said silicide film so that a doped impurity of said silicide film is diffused to control a work function of said silicide film; forming a gate electrode film by patterning said silicide film; forming source and drain regions by doping an impurity into said element region by using at least said gate electrode film as a mask; forming extension regions by doping an impurity into a region surrounding said element region by using said gate electrode film as a mask, wherein said forming of said extension regions is carried out between said forming of said gate electrode film and said forming of said source and drain regions; and forming a sidewall insulation film on a sidewall of said gate insulation film.