Patent ID: 7863170

Claim:
A method for producing at least one transistor structure using a semiconductor body comprising a substrate, the method comprising: performing a first implantation in the substrate; performing a second implantation in the substrate, wherein the first implantation and the second implantation produce a buried zone, and wherein a mask is used to perform the first implantation and the mask is used to perform the second implantation; forming, above the buried zone, a first zone comprising a semiconductor layer; performing a heat treatment to diffuse dopants into the first zone; forming, above the first zone, a second zone comprising a semiconductor layer; and forming, above the second zone, a third zone comprising a semiconductor layer; wherein the buried zone, the first zone, and the third zone are of a first conduction type, wherein the second zone is of a second conduction type, and wherein the first conduction type and the second conduction type are opposite conduction types.