Patent ID: 7859010
Filing Date: 2010-12-28
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate of a first conductivity type and a cathode layer of a second conductivity type formed on the semiconductor substrate; a base layer of the first conductivity type formed on the cathode layer; a first anode region of the second conductivity type formed in a surface of the base layer; a second anode region of the first conductivity type formed in the first anode region; a first semiconductor region of the first conductivity type formed on the surface of the base layer and in contact with the semiconductor substrate, said first semiconductor region being apart from the first anode region; a second semiconductor region of the second conductivity type formed adjacent to the first semiconductor region and in contact with the cathode layer, said second semiconductor region being apart from the first anode region; a contact region of the second conductivity type formed in a surface including a boundary portion between the first semiconductor region and the second semiconductor region; a cathode electrode formed on a surface of the semiconductor substrate; an anode electrode formed on surfaces of the first anode region and the second anode region; and an intermediate electrode formed on surfaces of the first semiconductor region and the contact region.