Patent ID: 8957461
Filing Date: 2015-02-17
Classification: H01L

Abstract:
1. A semiconductor device comprising: a cathode layer made of a first conductivity type semiconductor substrate; a drift layer provided on one principal surface of the cathode layer and made of a first conductivity type semiconductor substrate lower in concentration than the cathode layer; at least one first trench and an end portion trench provided in an upper surface of the drift layer so that the first trench is surrounded by the end portion trench; a first conductor embedded in each of the first trench and the end portion trench through an insulating film; an anode electrode provided on the upper surface of the drift layer so that the anode electrode is in contact with the first conductor, and that a Schottky barrier junction is formed between the anode electrode and the drift layer; and a cathode electrode provided on the other principal surface of the cathode layer, wherein: an outer circumferential side end portion of the anode electrode is in contact with the first conductor of the end portion trench; a field plate is provided separately from the anode electrode; a second trench is provided separately from the end portion trench so that the end portion trench is surrounded by the second trench; a second conductor is embedded in the second trench through an insulating film; and the field plate is in contact with the second conductor and with the drift layer in a mesa region between the end portion trench and the second trench, wherein a distance W