Patent ID: 9136324
Filing Date: 2015-09-15
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor layer of a first-conductivity-type; a first electrode connected to the semiconductor layer; a base layer of a second-conductivity-type selectively provided in a device section at a surface of the semiconductor layer; a source layer of the first-conductivity-type selectively provided at a surface of the base layer; a first pillar layer of the second-conductivity-type connected to the base layer, the first pillar layer being provided in portions spaced along a first direction parallel to the first electrode; a gate electrode provided via a gate insulating film on the source layer, the base layer, and the semiconductor layer; a second electrode connected to the source layer and the base layer; a second pillar layer of the second-conductivity-type provided in a termination section and extending from the surface of the semiconductor layer into the semiconductor layer along a second direction perpendicular to the first direction, the termination section surrounding the device section in a plane parallel to the first electrode; and a semiconductor region of the first-conductivity-type provided between the first electrode and the second pillar layer, wherein a concentration of first-conductivity-type impurities in the semiconductor region is lower than a concentration of first-conductivity-type impurities in the semiconductor layer, wherein a shortest distance along the second direction from the first pillar layer to the first electrode is less than a shortest distance along the second direction from the second pillar layer to the first electrode.