Patent ID: 11888046
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. A semiconductor device, comprising:
a substrate;
a first fin structure, a second fin structure, a third fin structure, and a fourth fin structure on the substrate;
a merged epitaxial region over the first and second fin structures;
a first unmerged epitaxial region and a second unmerged epitaxial region over the third and fourth fin structures, respectively;
an epitaxial buffer region over a top surface of the merged epitaxial region, wherein the top surface is substantially parallel to the substrate and having a length greater than a spacing between the first and second fin structures, and wherein a height of the merged epitaxial region is greater than heights of the first and second unmerged epitaxial regions;
a first epitaxial capping region over the epitaxial buffer region and side surfaces of the merged epitaxial region; and
a second epitaxial capping region directly over top and side surfaces of the first and second unmerged epitaxial region, respectively.