Patent ID: 8637378

Claim:
A method for producing a semiconductor component with a semiconductor body, comprising: providing a substrate of a first conduction type; providing a buried semiconductor layer of a second conduction type on the substrate; providing a functional unit semiconductor layer on the buried semiconductor layer; forming at least one trench in the semiconductor body which reaches right into the substrate; forming an insulating layer, which covers the inner walls of the trench and electrically insulates the trench interior from the functional unit semiconductor layer and the buried semiconductor layer but has a cutout at least in the region of the trench bottom; and filling the at least one trench with an electrically conductive material of the first conduction type, said electrically conductive material realizing an electrical contact to the substrate, completely filling the space within the trench with the electrically conductive material of the first conduction type and extending to the surface of the functional unit semiconductor layer; and wherein the electrically conductive material is a semiconductor material; and further comprising, prior to filling the at least one trench with the semiconductor material, introducing dopants of the first conduction type into the at least one trench, so that the doping concentration of that region of the substrate which adjoins the trench bottom of the at least one trench is increased with respect to the doping concentration of the substrate.