Patent ID: 8803192
Filing Date: 2014-08-12
Classification: H01L

Abstract:
1. A bipolar non-punch-through power semiconductor device comprising: a semiconductor wafer and a first electrical contact formed on a first main side of the wafer and a second electrical contact formed on a second main side of the wafer opposite the first main side; wherein said semiconductor wafer includes at least a two-layer structure with layers of different conductivity types, said at least two-layer structure having: wherein said semiconductor wafer includes an inner region having a constant wafer thickness measured between the first and second main side and a termination region, which surrounds the inner region and in which the wafer thickness is reduced at least on the first main side by a negative bevel, wherein the first layer extends to a first layer depth, the first layer depth being measured from a plane, in which the first main side is arranged within the inner region and wherein the first layer laterally extends into the termination region, and wherein the drift layer extends to a drift layer depth, the drift layer depth being measured within the inner region from the plane, in which the first main side is arranged within the inner region, a second layer of the second conductivity type is arranged in the termination region on the first main side, the second layer extending to the edge of the device, the second layer being arranged up to a second layer depth, the second layer depth being measured from a plane, in which the first main side is arranged within the inner region, and in that the second layer depth is larger than the first layer depth and shallower than the drift layer depth, a maximum doping concentration of the second layer is lower than a maximum doping concentration of the first layer, and wherein the first layer depth is at most 45 μm.