Patent ID: 11929401
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  C | IPC C  H

Claim 8:
9. A method comprising:
etching a substrate to form a fin therefrom;
forming a gate structure over the fin, the gate structure comprising a gate stack, a first gate spacer on a first side of the gate stack, and a second gate spacer on a second side of the gate stack;
etching a recess in the fin on the first side of the gate structure adjacent the first gate spacer;
performing a treatment on the recess to reduce a surface roughness of the recess, wherein during reducing the surface roughness of the recess, a metal layer is interposed between the substrate and a pedestal supporting the substrate, the treatment occurring with the recess in a gaseous hydrogen environment;
generating a hydrogen plasma, thereby creating hydrogen radicals and applying the hydrogen radicals to the recess;
transferring the substrate to a deposition chamber; and
forming an epitaxial source/drain region in the recess.