Patent ID: 6605858
Filing Date: 2003-08-12
Classification: H01L

Abstract:
A semiconductor power device comprising:a first base layer containing an impurity of a first conductivity type so as to have a concentration gradient which continuously changes in a thickness direction thereof; a second base layer containing an impurity of a second conductivity type formed in one surface region of said first base layer; a trench having such a depth as to reach from a surface of said second base layer through said second base layer to said first base layer; an emitter layer containing an impurity of said first conductivity type formed in the surface region of said second base layer in such a manner so as to be in contact with said trench; a gate electrode formed in said trench; a collector layer formed in the other surface of said first base layer, said collector layer contains an impurity of said second conductivity type and has a thickness of 1 &mgr;m or less; a first main electrode continuously formed on said emitter layer and said second base layer; and a second main electrode formed on said collector layer.