Patent ID: 11923437
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. A method comprising:
etching a semiconductor substrate to form a semiconductor region, with sidewalls of the semiconductor region being exposed;
filling trenches on opposing sides of the etched semiconductor region to form isolation regions;
recessing the isolation regions, so that a top portion of the semiconductor region protrudes higher than the isolation regions to form a first semiconductor fin; and
thinning the first semiconductor fin by etching the first semiconductor fin using an etching chemical, wherein a surface semiconductor layer of the first semiconductor fin is exposed to, and removed by, the etching chemical, and wherein when the first semiconductor fin is thinned, a second semiconductor fin formed of a different semiconductor material from the first semiconductor fin is also thinned.