Patent ID: 9064711
Filing Date: 2015-06-23
Classification: H01L

Abstract:
1. A semiconductor device comprising: an IGBT element region and a diode element region that are formed in one semiconductor substrate, wherein a first conductivity type collector layer, a second conductivity type drift layer, and a first conductivity type body layer are sequentially laminated in the IGBT element region, a first trench electrode that penetrates the body layer from a surface of the body layer, projects into the drift layer and is surrounded by an insulating film is formed, a second conductivity type emitter region is formed at a particular area that makes contact with the first trench electrode via the insulating film and is exposed at a surface of the semiconductor substrate, the emitter region being separated from the drift layer by the body layer, a second conductivity type cathode layer, a second conductivity type drift layer, and a first conductivity type anode layer are sequentially laminated in the diode element region, a second trench electrode that penetrates the anode layer from a surface of the anode layer, projects into the drift layer and is surrounded by an insulating film is formed, when the surface of the body layer on which an opening portion of the first trench electrode is formed and the surface of the anode layer on which an opening portion of the second trench electrode is formed are observed, a total length, per unit area of the diode element region, of a borderline configuring the opening portion of the second trench electrode is longer than a total length, per unit area of the IGBT element region, of a borderline configuring the opening portion of the first trench electrode, and a concentration of heavy metal included in the drift layer of the diode element region is higher than a concentration of heavy metal included in the drift layer of the IGBT element region.