Patent ID: 8252671

Claim:
A method for fabricating a field stop zone within a semiconductor device, the method comprising: providing a semiconductor device comprising a first and second connection region, and a semiconductor volume arranged between the first and second connection regions; performing a plurality of proton irradiations on the semiconductor volume, each of the plurality of proton irradiations comprising an implantation energy and a proton dose and at least one proton irradiation comprising an implantation energy of at least 500 keV; performing at least one heat treatment on the semiconductor volume, the at least one heat treatment comprising a temperature; and selecting the implantation energy and the proton dose of each proton irradiation of the plurality of proton irradiations and the temperature of the at least one heat treatment step so as to produce a dopant concentration profile such that an integral of an ionized dopant charge over the semiconductor volume, proceeding from a pn junction provided between the first connection region and a field stop zone, in the direction of the second connection region, substantially reaches a quantity of charge corresponding to a breakdown charge of the semiconductor device only near an interface of the field stop zone that is closest to the second connection region.