Patent ID: 11967616
Assignee: HITACHI ENERGY LTD
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. A method of forming a semiconductor device, the method comprising:
epitaxially growing a 4H-SiC epilayer on a 4H-SiC substrate, the 4H-SiC epilayer having n type doping and the 4H-SiC substrate having n type doping;
implanting a first region of p++ type, a second region of p type, a third region of p type and a fourth region of n++ type in a surface of the 4H-SiC epilayer;
epitaxially growing a 3C-SiC layer on the implanted surface of the 4H-SiC epilayer, wherein the 3C-SiC layer is grown to a vertical thickness of 0.1 to 50 nm;
partially oxidizing the 3C-SiC layer;
depositing an insulation layer over the partially oxidized 3C-SiC layer; and
forming a metal region on the insulation layer.