Patent ID: 7804150

Claim:
A field effect transistor (FET) comprising: a trench gate extending into a semiconductor region, the trench gate having a front wall facing a drain region of a first conductivity type and a side wall perpendicular to the front wall; a body region of a second conductivity type abutting the side wall of the trench gate; a source region of the first conductivity type abutting the side wall of the trench gate and extending in the body region so as to form a channel region in the body region along the side wall of the trench gate, the source region extending in a middle portion of the body region such that when the FET is in an on state, portions of a current that flows through the channel region flow in opposite directions; and a drift region extending at least between the drain region and the trench gate, the drift region comprising a stack of alternating conductivity type silicon layers.