Patent ID: 9293558
Filing Date: 2016-03-22
CPC Classification: H01L

Claim Text:
1. A semiconductor device, comprising a semiconductor body and at least two device cells integrated in the semiconductor body, each device cell comprising: a drift region, a source region, and a body region arranged between the source region and the drift region; a diode region, and a pn junction between the diode region and the drift region; a trench with a first sidewall, a second sidewall opposite to the first sidewall, and a bottom, wherein the body region adjoins the first sidewall, the diode region adjoins the second sidewall, and the pn junction adjoins the bottom of the trench; a gate electrode arranged in the trench and dielectrically insulated from the body region, the diode region and the drift region by a gate dielectric; and a source electrode electrically connected to the source region and the diode region of each device cell; wherein the diode regions of the at least two device cells are distant in a lateral direction of the semiconductor body, and wherein the diode region includes a first region and a second region, wherein the second region connects the first region to the source electrode, wherein the first region has a lower doping concentration than the second region, wherein the second region vertically extends from the source electrode to a lower side of the second region that is beneath the bottom of the trench, and wherein the first region is interposed between the lower side of the second region and the drift region along an entire span of the lower side of the second region so as to completely separate the lower side of the second region from the drift region.