Patent ID: 9059238
Filing Date: 2015-06-16
Classification: H01L

Abstract:
1. A semiconductor device comprising: an active region; and an edge termination structure region that surrounds the active region, wherein the active region includes: a first-conduction-type drift layer that is a first-conduction-type semiconductor substrate; a second-conduction-type base layer that is provided in one main surface of the first-conduction-type semiconductor substrate; a first-conduction-type semiconductor region that is selectively provided in the second-conduction-type base layer; a plurality of trenches that extend from the one main surface of the first-conduction-type semiconductor substrate to the first-conduction-type drift layer through the first-conduction-type semiconductor region and the second-conduction-type base layer and are arranged with a predetermined first gap therebetween; a trench gate structure including a gate insulating film that is provided in the trench along an inner wall of the trench and a gate electrode that is provided in the trench with the gate insulating film interposed therebetween; a metal electrode that contacts the second-conduction-type base layer and the first-conduction-type semiconductor region; a second-conduction-type extension region that is a portion of the second-conduction-type base layer which extends outward from the outermost trench among the plurality of trenches; and one or more annular outer trenches that extend from the one main surface of the first-conduction-type semiconductor substrate to the first-conduction-type drift layer through the second-conduction-type extension region and surround all of the trenches, and a second gap between the annular outer trench and the outermost trench or between the adjacent annular outer trenches when the plurality of annular outer trenches are provided is less than the first gap.