Patent ID: 8237205
Filing Date: 2012-08-07
Classification: H01L,Y10S

Abstract:
1. A semiconductor device comprising: a gate insulating film formed on a semiconductor region of a first conductivity type; a gate electrode formed on the gate insulating film; an offset spacer formed on a side surface of the gate electrode; an inner sidewall formed on the side surface of the gate electrode with the offset spacer interposed between the inner sidewall and the side surface of the gate electrode, and having an L-shaped cross section; and an insulating film formed to cover the gate electrode, the offset spacer, the inner sidewall, and a part of the semiconductor region located laterally outward from the inner sidewall, wherein the offset spacer includes an inner offset spacer formed on and in contact with the side surface of the gate electrode and having a rectangular cross section, and an outer offset spacer formed to cover the side surface of the gate electrode and the inner offset spacer, the outer offset spacer is in contact with a top end surface and an outer side surface of the inner offset spacer, and the inner offset spacer is formed as a single layer.