Patent ID: 7768101
Filing Date: 2010-08-03
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate having a first main surface and a second main surface opposed to each other; an insulated gate field effect transistor portion of an insulated gate bipolar transistor formed on a side of said first main surface of said semiconductor substrate; an anode region of a first conductivity type of a free wheel diode formed in said first main surface of said semiconductor substrate; a collector region of the first conductivity type of the insulated gate bipolar transistor formed in said second main surface of said semiconductor substrate; a cathode region of a second conductivity type of said free wheel diode formed in said second main surface of said semiconductor substrate; a back electrode formed on said second main surface so as to be in contact with both of said collector region and said cathode region and having a titanium layer, a nickel layer and a gold layer successively stacked from a side of said second main surface; and an emitter electrode in contact with said anode region at said first main surface, wherein a contact portion between said cathode region and said collector region is located directly below a contact portion between said emitter electrode and said anode region.