Patent ID: 6818940
Filing Date: 2004-11-16
Classification: H01L

Abstract:
An insulated gate bipolar transistor comprising:a first semiconductor layer of a first conductivity type; a second semiconductor layer of a second conductivity type formed on a top surface of said first semiconductor layer; a base layer of the first conductivity type formed on a top surface of said second semiconductor layer; a plurality of gate electrodes each of which is buried in a trench with a gate insulation film interposed therebetween, said trench being formed in said base layer to a depth reaching said second semiconductor layer from a surface of said base layer, each said gate electrode having an upper surface of a rectangular pattern with different widths in two orthogonal directions, said gate electrodes being disposed in a direction along a short side of the rectangular pattern; emitter layers of the second conductivity type formed in the surface of said base layer to oppose both end portions of each said gate electrode in a direction along a long side of the rectangular pattern; a first main electrode in contact with said emitter layers and said base layer; and a second main electrode formed at a bottom surface of said first semiconductor layer.