Patent ID: 8860169
Filing Date: 2014-10-14
Classification: H01L

Abstract:
1. A semiconductor device comprising: (a) a semiconductor substrate of a first conductivity type; (b) a first semiconductor region of a second conductivity type corresponding to a conductivity type opposite to the first conductivity type, the first semiconductor region being formed in the semiconductor substrate; (c) a second semiconductor region of the first conductivity type, the second semiconductor region being formed in the semiconductor substrate within the first semiconductor region; (d) a third semiconductor region of the first conductivity type, the third semiconductor region being formed in the semiconductor substrate within the second semiconductor region; (e) a first conductor film formed over the semiconductor substrate so as to integrally cover the first semiconductor region, the second semiconductor region, and the third semiconductor region provided thereinside and to be electrically coupled to the first semiconductor region and the third semiconductor region, respectively; (f) a first conductive portion electrically coupled to the first conductor film; (g) a first insulating film formed over the semiconductor substrate, the first insulating film being formed so as to surround the third semiconductor region in a plan view; (h) a fourth semiconductor region of the second conductivity type, the fourth semiconductor region being formed outside the third semiconductor region within the first semiconductor region with the first insulating film remaining therebetween; (i) a second conductor film formed in the semiconductor substrate so as to cover the fourth semiconductor region and to be electrically coupled to the fourth semiconductor region; (j) a second conductive portion electrically coupled to the second conductor film; and (k) a fifth semiconductor region of the second conductivity type, the fifth semiconductor region being formed in the semiconductor substrate within the first semiconductor region, wherein electrical coupling of the first semiconductor region and the first conductor film is Schottky coupling, wherein the second semiconductor region and the third semiconductor region are formed at an end of the first conductor film in the first semiconductor region, wherein an impurity concentration of the third semiconductor region is higher than an impurity concentration of the second semiconductor region, wherein the second semiconductor region extends into the first semiconductor region more than the first insulating film, wherein the third semiconductor region extends into the first semiconductor region less than the first insulating film, wherein the second semiconductor region, the third semiconductor region, and the fourth semiconductor region are formed in the fifth semiconductor region, and wherein an impurity concentration of the fifth semiconductor region is higher than an impurity concentration of the first semiconductor region.