Patent ID: 11929420
Assignee: WOLFSPEED, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 20:
21. A semiconductor device, comprising:
a silicon carbide semiconductor layer structure that comprises a first conductivity type drift region, and first and second well regions in an upper surface of the first conductivity type drift region, the first and second well regions separated by a JFET region;
a gate dielectric layer on the silicon carbide semiconductor layer structure, the gate dielectric layer comprising a base gate dielectric layer that is on the silicon carbide semiconductor layer structure and a capping gate dielectric layer on the base gate dielectric layer, the capping gate dielectric layer comprising a different material than the base gate dielectric layer; and
a gate electrode on the gate dielectric layer opposite the silicon carbide semiconductor layer structure,
wherein the gate electrode directly contacts both the capping gate dielectric layer and the base gate dielectric layer, and
wherein the gate dielectric layer extends laterally beyond sidewalls of the gate electrode.