Patent ID: 11862508
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. A method of forming a semiconductor device, the method comprising:
forming a semiconductor fin over a substrate;
forming a dummy gate structure over the semiconductor fin;
forming one or more dielectric layers on opposing sidewalls of the dummy gate structure;
removing the dummy gate structure to form a trench, the trench exposing the semiconductor fin;
performing an etching process on the semiconductor fin to extend the trench into the semiconductor fin;
forming a first dielectric material in the trench, an upper surface of the first dielectric material being lower than an upper surface of the semiconductor fin;
forming a second dielectric material over the first dielectric material, an upper surface of the second dielectric material being higher than an upper surface of the semiconductor fin, wherein the second dielectric material has a void or seam; and
removing an upper portion of the second dielectric material to completely remove the void or seam.