Patent ID: 8546905
Filing Date: 2013-10-01
Classification: H01L

Abstract:
1. A semiconductor integrated circuit device comprising: (a) a semiconductor substrate having a first principal surface and a second principal surface; and (b) a Schottky barrier diode portion provided in the first principal surface of the semiconductor substrate, wherein the Schottky barrier diode portion comprises: (b1) a first semiconductor region of a first conductivity type provided in the first principal surface; (b2) a first field insulating film region having an opening and provided in the first principal surface in the first semiconductor region; (b3) a guard ring region of a second conductivity type opposite to the first conductivity type provided in the first principal surface in the opening of the first field insulating film region so as to be in contact with and along an inner periphery of the first field insulating film region; (b4) a Schottky junction cathode portion in which the first semiconductor region is exposed at the first principal surface within the guard ring region; (b5) a silicide film provided over the first principal surface over the opening of the first field insulating film region; and (b6) an anode contact electrode provided over the silicide film over the opening of the first field insulating film region, wherein the first field insulating film region is in the form of an isolation trench formed in the semiconductor substrate and filled with an insulating film, wherein the anode contact electrode is provided primarily over the guard ring region, wherein a CMOS integrated circuit portion is provided in the first principal surface of the semiconductor substrate, and wherein the first semiconductor region of the Schottky barrier diode portion is electrically isolated from the CMOS integrated circuit portion by a ring-shaped isolation region of the second conductivity type.