Patent ID: 9087894
Filing Date: 2015-07-21
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a substrate having a semiconductor layer on a principal surface thereof; a trench provided in the semiconductor layer; a first first-conductivity-type impurity region provided in an upper portion of the semiconductor layer around the trench; a gate insulating film provided on a sidewall surface of the trench and on the portion of the semiconductor layer around the trench; a gate electrode provided on a portion of the gate insulating film inside the trench, and on the gate insulating film on the portion of the semiconductor layer around the trench; and another electrode directly contacting the first first-conductivity-type impurity region, wherein: a second-conductivity-type impurity region and a second first-conductivity-type impurity region are interposed around the trench between a portion of the gate electrode and the first-first-conductivity-type impurity region, and are formed sequentially on the first first-conductivity-type impurity region.