Patent ID: 11869966
Assignee: INFINEON TECHNOLOGIES AUSTRIA AG
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 12:
13. A method, comprising:
forming a trench in a first surface in an edge region of a semiconductor body;
forming a plurality of superjunction transistor cells in an inner region of a semiconductor body; and
forming an insulation layer on the first surface of the semiconductor body in the edge region and in the inner region,
wherein forming the insulation layer comprises a thermal oxidation process,
wherein forming the insulation layer generates interstitials at an interface between the insulation layer and the semiconductor body,
wherein the interstitials diffuse into the semiconductor body, and
wherein the interstitials influence the diffusion of first type dopant atoms and second type dopant atoms that are used to form superjuction structures of the superjunction transistor cells.