Patent ID: 7335947

Claim:
A semiconductor device comprising: a semiconductive body having a first major surface and a second major surface opposing said first major surface; a plurality of trenches extending from a top portion of said first major surface to a predetermined depth, each said trench having two opposing vertical walls and a bottom portion, and each said trench being lined by an insulation layer and filled with a conductive material; a plurality of L-shaped emitter regions of a first conductivity, each emitter region disposed at a vertical wall of a trench and including a vertically oriented portion extending from a top of said first major surface to a predetermined depth and a horizontally oriented portion extending laterally from an upper edge thereof, said vertically oriented portion and said horizontally oriented portion of each L-shaped emitter region having a depth and a conductivity, said depth and said conductivity of said vertically oriented portion being configured independently of said depth and said conductivity of said horizontally oriented portion; a collector region of said first conductivity; a channel region of a second conductivity disposed between said emitter regions and said collector region; a high conductivity region of said second conductivity formed in said channel region at the bottom of a recess, said recess including at least two opposing sidewalls, each sidewall coinciding with a respective horizontal portion of a respective L-shaped emitter region; and an emitter contact electrically connected to said high conductivity region and said sidewalls of said recess.