Patent ID: 6670650
Filing Date: 2003-12-30
Classification: H01L

Abstract:
A semiconductor device comprising:a semiconductor substrate having a first major surface, an opposing second major surface, and a first conductivity type; an anode electrode formed on the first major surface of the semiconductor substrate; a plurality of Schottky contacts between the anode electrode and the semiconductor substrate; a cathode region formed on a surface layer of the second major surface of the semiconductor substrate; a cathode electrode formed on the cathode region on a side of the cathode region opposite the second major surface of the semiconductor substrate; a plurality of ring-shaped trenches, in a surface layer of the first major surface of the semiconductor substrate, having a prescribed width; a plurality of first Schottky contacts between the anode electrode and portions of the semiconductor substrate that are located inside the trenches; a plurality of second Schottky contacts between the anode electrode and portions of the semiconductor substrate that are located outside the trenches; insulating films formed on side walls of the trenches; first semiconductor regions having a second conductivity type and contacting bottoms of the trenches; and conductive materials filling the trenches and electrically connecting the first semiconductor regions to the anode electrode.