Patent ID: 7244988

Claim:
A semiconductor apparatus comprising: a gate electrode formed on a surface of a semiconductor substrate with a gate insulating film provided therebetween; a gate sidewall insulating film having a three-layered structure formed of a first nitride film, an oxide film, and a second nitride film, which are formed on a sidewall of an upper portion of the gate electrode, and a gate sidewall insulating film having a two-layered structure formed of the oxide film and the second nitride film, which are formed on a sidewall of a lower portion of the gate electrode; and a raised source/drain region formed of an impurity region formed in a surface layer of the semiconductor substrate and an impurity region grown on the impurity region, wherein the gate electrode comprises a polysilicon germanium layer, a polysilicon layer and a silicide layer are sequentially formed on the semiconductor substrate in order, and wherein the gate sidewall insulating film having a three-layered structure is formed on a sidewall of the silicide layer and a sidewall of the polysilicon layer, and the gate sidewall insulating film having a two-layered structure is formed on a sidewall of the polysilicon germanium layer.