Patent ID: 11935954
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B | IPC H

Claim 15:
16. A method for forming a semiconductor device structure, comprising:
forming a fin structure with alternating first semiconductor layers and second semiconductor layers stacked over a substrate;
forming a dummy gate structure across the fin structure;
forming spacer layers over opposite sides of the dummy gate structure;
partially removing the fin structure exposed by the dummy gate structure;
recessing a sidewall of the first semiconductor layers;
forming an inner spacer over the sidewall of the first semiconductor layers, wherein the inner spacer partially overlaps the spacer layers and is formed over a sidewall of a lower portion of the spacer layers;
growing source/drain epitaxial structures over opposite sides of the fin structure;
removing the dummy gate structure and the first semiconductor layers; and
forming a gate structure surrounding the second semiconductor layers.