Patent ID: 8461622
Filing Date: 2013-06-11
Classification: H01L

Abstract:
1. A reverse-conducting semiconductor device comprising: a wafer; a freewheeling diode arranged on the wafer; and an insulated gate bipolar transistor arranged on the wafer, wherein: part of the wafer which has an un-amended doping in the finalized reverse-conducting semiconductor device forms a base layer; the insulated gate bipolar transistor comprises a collector side and an emitter side, the collector side being arranged opposite of the emitter side of the wafer; the base layer has a base layer thickness, which is defined as the maximum thickness which the base layer has between the collector side and the emitter side; a first layer of a first conductivity type and a second layer of a second conductivity type, which is different from the first conductivity type, are arranged alternately on the collector side; the first layer comprises at least one first region, wherein each first region is surrounded by a first region border, which constitutes an interface between the corresponding first region and the second layer or a portion of the first layer not including the corresponding first region, and has a first region width, the first layer comprises at least one first pilot region, wherein each first pilot region is surrounded by a first pilot region border, which constitutes an interface between the corresponding first pilot region and the second layer of a portion of the first layer not including the corresponding first pilot region and the at least one first region, and has a first pilot region width; the second layer comprises at least one second region, wherein each second region is surrounded by a second region border, which constitutes an interface between the corresponding second region and a second layer or a portion of the second layer not including the corresponding second region, and has a second region width, the second layer comprises at least one second pilot region, wherein each second pilot region is surrounded by a second pilot region border, which constitutes an interface between the corresponding second pilot region and the first layer or a portion of the second layer not including the corresponding second pilot region, and has a second pilot region width; each region or layer width is defined as two times the maximum value of a shortest distance between any point within the region or layer and a point on the region or layer border; the second layer has a non-uniform structure across the entirety of the second layer; each first region width is smaller than the base layer thickness; each second region width is equal to or larger than the base layer thickness; each first pilot region width is equal to or larger than the base layer thickness; each second pilot region width is larger than two times the base layer thickness; each second pilot region width is larger than each first pilot region width; and the sum of the areas of the at least one second pilot region is larger than the sum of the areas of the at least one first pilot region.