Patent ID: 7602016
Filing Date: 2009-10-13
Classification: H01L

Abstract:
1. A semiconductor apparatus comprising: a gate electrode formed on a surface of a semiconductor substrate with a gate insulating film provided therebetween; a three-layered gate sidewall insulating structure comprising a first nitride film, an oxide film, and a second nitride film, wherein the three-layered structure is formed on a sidewall of an upper portion of the gate electrode; a two-layered gate sidewall insulating structure comprising the oxide film and the second nitride film, wherein the two-layered structure is formed on a sidewall of a lower portion of the gate electrode; and a raised source/drain region comprising an impurity region formed in a surface layer of the semiconductor substrate, wherein the gate electrode comprises: wherein a width of the lower portion of the gate electrode is larger than that of the upper portion of the gate electrode, and wherein the three-layered structure is formed on a sidewall of the silicide layer and a sidewall of the polysilicon layer. wherein the two-layered structure is formed on a sidewall of the polysilicon germanium layer.