Patent ID: 11862714
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 18:
19. A method of manufacturing a semiconductor device, the method comprising:
forming a semiconductor layer over a semiconductor substrate;
forming a fin structure by patterning the semiconductor layer and the semiconductor substrate using a dielectric hard mask pattern, so that the fin structure has a bottom part corresponding to the semiconductor substrate and an upper part corresponding to the semiconductor layer;
trimming the bottom part so that a width of the bottom part is smaller than a width of the upper part;
trimming bottom end corners of the upper part to reduce a width of a bottom of the upper part; and
after the trimming the bottom end corners, forming an isolation insulating layer so that the upper part protrudes from the isolation insulating layer.