Patent ID: 7465986

Claim:
A power semiconductor device, comprising: a semiconductor body of a first conductivity type; a plurality of gate trenches extending to a first depth within said semiconductor body; a plurality of source trenches extending to a second depth within said semiconductor body, said second depth being greater than said first depth; an insulated gate electrode within each of said plurality of gate trenches; an insulated source electrode within each of said plurality of source trenches; a channel region of a second conductivity type in said semiconductor body and having an etched surface adjacent to each of said plurality of source trenches; source regions formed over said channel region; and a source contact contacting said source regions, said source electrodes and contacting said channel region along said etched surfaces; wherein said plurality of gate trenches and said plurality of source trenches are arranged in a cellular design and wherein said insulated source electrodes are recessed to a depth below said source regions and contact said source contact below said source regions.