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

Claim 8:
9. A semiconductor device, comprising:
a semiconductor layer structure that comprises silicon carbide, the semiconductor layer structure comprising a trench formed therein, where at least some corners of the trench are rounded;
a gate dielectric layer on the semiconductor layer structure-and within the trench, the gate dielectric layer comprising lower corners and upper corners, where at least one of the lower corners and upper corners comprises a rounded corner; and
a gate electrode on the gate dielectric layer opposite the semiconductor layer structure
wherein the gate dielectric layer comprises a silicon oxide base gate dielectric layer and first and second capping gate dielectric layers that are on respective lower and upper surfaces of the silicon oxide base gate dielectric layer, where the first and second capping gate dielectric layers each has a dielectric constant that is greater than a dielectric constant of the silicon oxide base gate dielectric layer.