Patent ID: 7767527

Claim:
A method for producing a vertical transistor component, comprising: a) providing a semiconductor substrate, b) providing an auxiliary layer on the semiconductor substrate, c) patterning the auxiliary layer such that at least a first trench is produced that extends as far as a surface of the semiconductor substrate, the first trench having opposite sidewalls, d) producing a monocrystalline semiconductor layer on at least one of the sidewalls of the first trench, and e) producing an electrode insulated from the monocrystalline semiconductor layer and the semiconductor substrate, f) removing the auxiliary layer, thereby forming a second trench that extends to the substrate; g) introducing dopants of a conduction type that is complementary to the conduction type of the semiconductor substrate in the semiconductor substrate at the bottom of the second trench, thereby forming a further semiconductor zone that forms a pn-junction with the semiconductor substrate; h) forming an electrode in the second trench that contacts the further semiconductor zone.