Patent ID: 8884367

Claim:
A power semiconductor device comprising: a semiconductor body having a common conduction region of one conductivity type, and a base region of another conductivity type, said semiconductor body including a first surface; a trench extending from said first surface through said base region and into said common conduction region, said trench including at least two opposing sidewalls and a bottom; an insulated gate electrode including both a gate insulation adjacent one of said sidewalls and a gate electrode adjacent said gate insulation which spans said base region; a source field electrode inside said trench, said source field electrode including a first portion spanning said gate electrode and a second portion extending to a depth below said insulated gate electrode; a source region adjacent a sidewall of said trench and said base region; and a source contact ohmically coupled to said source region, wherein said source contact is in direct ohmic contact with at least a portion of a sidewall of said source field electrode that is parallel to said trench sidewalls.