Patent ID: 7952143
Filing Date: 2011-05-31
Classification: H01L

Abstract:
1. A semiconductor device in which both an IGBT element region and a diode element region are formed on the same semiconductor substrate, the semiconductor device comprising: a p-type collector layer, an n-type drift layer, and a p-type body layer that are laminated in order in the IGBT element region; a trench gate electrode that extends through the body layer from a front surface of the body layer to project into the drift layer; an insulating film that surrounds the trench gate electrode; an n-type emitter region that is in contact with the insulating film and is formed in an area that faces the front surface of the body layer, wherein the emitter region is separated from the drift layer by the body layer; an n-type cathode layer, the drift layer, and a p-type anode layer that are laminated in order in the diode element region; an anode region that is formed in an area that faces a front surface of the anode layer, and contains a p-type impurity at higher concentration than in the anode layer, wherein the anode region is separated from the drift layer by the anode layer; a low lifetime region that is formed in at least a part of the drift layer within the diode element region, and shortens a lifetime of a hole, wherein a mean value of a lifetime of a hole in the drift layer that includes the low lifetime region is shorter within the diode element region than within the IGBT element region, and wherein a non-conductive impurity is present at a higher concentration in the low lifetime region than in the drift layer excluding the low lifetime region.