Patent ID: 6417554
Filing Date: 2002-07-09
Classification: H01L

Abstract:
A three layer IGBT comprising, in combination; an emitter layer of one conductivity type, a body layer of the opposite conductivity type formed atop said emitter layer, a plurality of spaced base layers of said one conductivity type formed in the top of said body layer, a vertical trench disposed between and spaced apart from each of said spaced base layers; a gate insulation layer lining the walls and bottom of said trench and a conductive polysilicon filling the interior of said trenches to form a polysilicon gate, an emitter contact connected to the bottom of said emitter layer, a collector contact connected to each of said spaced base layers, and a Schottky contact connected to the top of said body layer in an area which at least one of surrounds and abuts the top of said trench.