Patent ID: 7919824
Filing Date: 2011-04-05
Classification: H01L

Abstract:
1. A semiconductor device comprising: a first-conductivity-type semiconductor substrate having mutually opposing top and bottom surfaces; a super junction region having a first-conductivity-type first semiconductor pillar region and a second-conductivity-type second semiconductor pillar region alternately provided on the semiconductor substrate; a device region having a second-conductivity-type semiconductor base region on the super junction region; and a termination region being provided on the super junction region outside of an end portion of the semiconductor base region and around a circumference of the device region, the first semiconductor pillar region and the second semiconductor pillar region in a device region having a stripe form in a first direction along the semiconductor substrate taken as a longitudinal direction, the first semiconductor pillar region and the second semiconductor pillar region in a termination region having a lamination form resulting from alternate lamination of the first semiconductor pillar region and the second semiconductor pillar region on the top surface of the semiconductor substrate, the first semiconductor pillar region and/or the second semiconductor pillar region at a corner part of the termination region exhibiting an impurity concentration distribution such that a plurality of impurity concentration peaks appear periodically along a curve proceeding from the first direction to a second direction orthogonal to the first direction at the corner part, and having an impurity amount such that it becomes smaller as being closer to the circumference of the corner part.