Patent ID: 7652350
Filing Date: 2010-01-26
Classification: H01L

Abstract:
1. A semiconductor device comprising a horizontal unit semiconductor element, the horizontal unit semiconductor element comprising: a) a semiconductor substrate of a first conductivity type; b) a semiconductor region of a second conductivity type formed on the semiconductor substrate; c) a collector layer of the first conductivity type formed within the semiconductor region; d) a base layer of the first conductivity type having an endless shape and formed within the semiconductor region such that the base layer is off the collector layer but surrounds the collector layer; e) a first emitter layer of the second conductivity type formed in the base layer; f) an emitter electrode; and g) a second emitter layer of the first conductivity type formed surrounding the first emitter layer, and a cross-section of the second emitter layer is in contact with an entire bottom surface of the emitter electrode, the horizontal unit semiconductor element controlling, within a channel region formed in the base layer, movement of carriers between the first emitter layer and the collector layer, wherein the first emitter layer is formed by plural unit emitter layers which are formed along the base layer.