Patent ID: 7646059
Filing Date: 2010-01-12
Classification: H01L

Abstract:
1. A semiconductor device comprising: a body layer of a first conductivity type on a semiconductor substrate; a source layer of a second conductivity type in a surface region of the body layer; an offset layer of the second conductivity type on the semiconductor substrate, the offset layer having a first peak of an impurity concentration profile and a second peak of an impurity concentration profile; a drain layer of the second conductivity type in a surface region of the offset layer; an insulating film located in the surface region of the offset layer between the source layer and the drain layer; a gate insulating film formed on the body layer and the offset layer between the source layer and the insulating film; and a gate electrode formed on the gate insulating film, wherein the first peak of an impurity concentration profile is located at a position shallower than a bottom of the insulating film, the second peak of an impurity concentration profile is located at a position deeper than the bottom of the insulating film, and the first peak of an impurity concentration profile is higher than the impurity concentration profile of the bottom of the insulating film and the second peak of an impurity concentration profile is higher than the impurity concentration profile of the bottom of the insulating film.