Patent ID: 7342422
Filing Date: 2008-03-11
Classification: H01L

Abstract:
1. A semiconductor device comprising: a cell region including a plurality of semiconductor switching cells; a terminal region disposed around the cell region; a lower semiconductor layer having a first conductive type; an intermediate semiconductor layer disposed on the lower semiconductor layer, wherein the intermediate semiconductor layer includes a super junction structure, in which a first region having the first conductive type and a second region having a second conductive type are repeatedly arranged in a horizontal direction perpendicular to a thickness direction of the intermediate semiconductor layer, and wherein the first region extends in the thickness direction of the intermediate semiconductor layer, and the second region extends in the thickness direction of the intermediate semiconductor layer; a terminal upper semiconductor layer disposed on the intermediate semiconductor layer in the terminal region, wherein the terminal upper semiconductor layer has the second conductive type and a low impurity concentration; a terminal contact semiconductor region disposed on a surface portion of the terminal upper semiconductor layer in the terminal region, wherein the terminal contact semiconductor region is disposed adjacent to the cell region, and wherein the terminal contact semiconductor region has the second conductive type and a high impurity concentration; an insulation layer disposed on the terminal upper semiconductor layer in the terminal region, wherein the insulation layer has first and second parts, the first part which is disposed adjacent to the cell region and has a small thickness, and the second part which is disposed adjacent to the first part of the insulation layer and has a large thickness, and wherein the first part of the insulation layer is disposed on the terminal contact semiconductor region and on a part of the terminal upper semiconductor layer; and a conductive layer disposed in the cell region and a part of the terminal region, wherein the conductive layer is disposed on the first part of the insulation layer and on a part of the second part of the insulation layer so that the conductive layer extends from the cell region to the part of the terminal region beyond the first part of the insulation layer.