Patent ID: 8587053

Claim:
A semiconductor device, comprising: a drain region formed from a semiconductor region of first conductivity type; a body region formed from a semiconductor region of second conductivity type made on the drain region; a source region formed from the semiconductor region of first conductivity type formed within the body region; a body contact region that is formed in an area which lies in the body region but differs from the source region and that is formed from a highly-doped semiconductor region of second conductivity type; trenches formed so as to extend from the source region to the drain region while passing through the body region; a gate electrode formed within each of the trenches; a source electrode formed so as to contact the source region and the body contact region; and a drain electrode formed in the drain region, wherein each of the trenches has a substantially linear tapered surface spreading outside from an edge of an opening; and wherein an area between the source region and the source electrode filled in each of the trenches makes up a source-contact region, and said source electrode contacts said body contact region along the tapered surface of each trench.