Patent ID: 8021938

Claim:
A method for fabricating a semiconductor device comprising the steps of: (a) sequentially forming a first material film and a first conductive film over the entire surface of a semiconductor substrate, the first material film being insulative and containing a first metal, and the semiconductor substrate including a first region and a second region separate from each other by a device isolation region; (b) removing a portion of the first conductive film formed over the second region; (c) after step (b), sequentially forming a second material film containing a second metal and a second conductive film over the entire surface of the semiconductor substrate; (d) after step (c), removing portions of the second conductive film and the second material film formed over the first region; (e) after step (d), forming a polysilicon film over the entire surface of the semiconductor substrate; and (f) selectively removing the polysilicon film, the first conductive film, the first material film, the second conductive film, and the second material film to form a first gate electrode including the polysilicon film and the first conductive film and a first gate insulating film including the first material film over the first region and to form a second gate electrode including the polysilicon film and the second conductive film and a second gate insulating film including the second material film and the first material film over the second region.