Patent ID: 9536944
Date: 2017-01-03
CPC Classifications: H01L

Claim:
1. A semiconductor device comprising: a semiconductor substrate of a first conductivity type having a front surface and a rear surface; a super junction structure having a repetitive structure in which first conductivity type columns and second conductivity type columns are repeated in parallel to a surface of the semiconductor substrate, on a front surface side of the semiconductor substrate; a semiconductor layer formed on the super junction structure in a cell region and in an outer peripheral region surrounding the cell region, the outer peripheral region of the semiconductor layer corresponding to an outer peripheral side of the semiconductor substrate including a vertical semiconductor element formed inside the outer peripheral region; a high impurity layer of a second conductivity type formed in the semiconductor layer on the super junction structure in the cell region, and having an impurity concentration higher than an impurity concentration of the semiconductor layer; a front surface electrode formed to enter the outer peripheral region from the cell region, and formed in contact with the high impurity layer; a rear surface electrode electrically connected to a rear surface side of the semiconductor substrate; and a deep layer of the second conductivity type having an impurity concentration higher than an impurity concentration of the super junction structure, not depleted, and extending from a position having a predetermined depth from a surface of the semiconductor layer and extending around an outer edge of the front surface electrode when viewed from a substrate normal direction, wherein the deep layer contacts each of the high impurity layer, the semiconductor layer and the super junction structure, and is completely surrounded by a combination of the high impurity layer, the semiconductor layer and the super junction structure when viewed from the substrate normal direction, and wherein the deep layer has an overlapping portion extending between a first end of a portion of the front surface electrode which comes in contact with the high impurity layer on a most outer peripheral side and an end of the high impurity layer on the outer peripheral side when viewed from the substrate normal direction.