Patent ID: 8552476
Filing Date: 2013-10-08
Classification: H01L

Abstract:
1. A semiconductor device comprising: a cathode electrode; a semiconductor substrate of a first conductivity type electrically connected to the cathode electrode and having a first impurity concentration; a semiconductor layer of the first conductivity type formed on the semiconductor substrate and having a second impurity concentration lower than the first impurity concentration; a plurality of first trenches formed in the semiconductor layer to extend downward from an upper surface of the semiconductor layer; a plurality of insulation layers each formed on each inner wall of the first trenches; a plurality of conductive layers each formed in the first trenches on the insulation layers and extending downward from the upper surface of the semiconductor layer to a first position; a first semiconductor diffusion layer of the first conductivity type reaching a second position from the upper surface of the semiconductor layer, positioned between the first trenches, and having a third impurity concentration lower than the second impurity concentration; and an anode electrode formed on upper surfaces of the first semiconductor diffusion layer and the conductive layers, and having a schottky junction with the first semiconductor diffusion layer, and a length from the upper surface of the semiconductor layer to the second position being equal to or less than half a length from the upper surface of the semiconductor layer to the first position.