Patent ID: 6495871
Filing Date: 2002-12-17
Classification: H01L

Abstract:
A semiconductor element, comprising:a first base layer of a first conductivity type; a second base layer of a second conductivity type formed selectively in one surface region of said first base layer; an emitter layer or a source layer of the first conductivity type formed selectively in a surface region of said second base layer; a gate electrode formed on that portion of said second base layer which is positioned between said emitter layer or source layer and said first base layer with a gate insulating film interposed between said gate electrode and said second base layer; a collector layer or a drain layer formed on the other surface region of said first base layer or formed selectively on one surface region of the first base layer; a first main electrode formed on said collector layer or on said drain layer; a second main electrode formed on said emitter layer or source layer and on said second base layer; and a channel region formed in contact with said gate insulating film to permit the carrier to migrate between the emitter layer or source layer and the first base layer, said channel region having an impurity concentration profile such that the impurity concentration that permits bringing about a pinch-off phenomenon most promptly within said channel is formed in a position closer to the first base layer than to the junction between the emitter layer or source layer and the second base layer.