Patent ID: 11949015
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method comprising:
forming a semiconductor fin extending from a substrate;
forming a gate structure extending across the semiconductor fin;
etching recesses in the semiconductor fin, the recesses being at opposite sides of the gate structure;
forming source/drain epitaxial structures in the recesses in the semiconductor fin, wherein the formation of each of the source/drain epitaxial structures comprises:
performing a first epitaxy growth process to form a bar-shaped epitaxial structure in one of the recesses; and
performing a second epitaxy growth process to form a cladding epitaxial layer cladding on the bar-shaped epitaxial structure, wherein the bar-shaped epitaxial structure has a lower phosphorous concentration than the cladding epitaxial layer.