Patent ID: 11862712
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method of semiconductor device fabrication, comprising:
forming a first fin structure and a second fin structure extending from a substrate;
forming a gate structure over the first fin structure and the second fin structure;
forming an epitaxial feature over the first fin structure and the second fin structure, wherein the forming the epitaxial feature includes:
growing a first epitaxial feature having a first portion over the first fin structure and a second portion over the second fin structure;
growing a second epitaxial feature over the first and second portions of the first epitaxial feature, wherein the second epitaxial feature includes a merged portion between the first fin structure and the second fin structure, wherein the growing the second epitaxial feature includes using hydrogen (H2) as a carrier gas; and
growing a third epitaxial feature over the second epitaxial feature, wherein the growing the first epitaxial feature and the growing the third epitaxial feature are including using nitrogen (N2) as a carrier gas.