Patent ID: 9087893
Filing Date: 2015-07-21
Classification: H01L

Abstract:
1. A semiconductor device, characterized by comprising: an active portion provided on a first main surface side; a low resistance layer provided on a second main surface side; a parallel p-n layer, provided between the active portion and low resistance layer, wherein a first conductivity type region and second conductivity type region are disposed alternately; a second conductivity type base region, provided on the first main surface side of the second conductivity type region, that has an impurity concentration higher than that of the second conductivity type region; and a first conductivity type high concentration region, provided on the first main surface side of the first conductivity type region, that is positioned farther to the second main surface side than an end portion on the second main surface side of the second conductivity type base region, and has an impurity concentration higher than an impurity concentration on the second main surface side of the first conductivity type region wherein the first conductivity type high concentration region has one-eighth or more and one-fourth or less the thickness of the first conductivity type region positioned at a depth from the end portion on the second main surface side of the second conductivity type base region to the end portion on the second main surface side of the second conductivity type region.