Patent ID: 7288815

Claim:
A semiconductor device, comprising: a channel region of a first conductivity type formed at a surface layer portion of a semiconductor substrate; a source region of a second conductivity type which is different from the first conductivity type, the source region being formed at a rim of a trench having a depth sufficient to penetrate through the channel region; a drain region of the second conductivity type formed at a region adjacent to a bottom of the trench; a gate insulating film formed along an inner side wall of the trench; a gate electrode arranged in the trench so as to be opposed to the channel region with the gate insulating film interposed therebetween; at least one conductive layer formed in the trench so as to be nearer to the drain region than the gate electrode; and an insulating layer surrounding the conductive layer to electrically insulate the conductive layer from the gate electrode and the drain region.