Patent ID: 11973077
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B | IPC H

Claim 14:
15. A method, comprising:
forming a dummy gate over a substrate;
forming a sacrificial epitaxial plug in the substrate;
depositing a source/drain epitaxial structure over the sacrificial epitaxial plug and on a side of the dummy gate;
replacing the dummy gate with a gate structure;
removing the substrate such that the sacrificial epitaxial plug protrudes from a backside of the source/drain epitaxial structure;
forming a sacrificial epitaxial structure to cover the sacrificial epitaxial plug;
depositing an isolation material to surround the sacrificial epitaxial plug and the sacrificial epitaxial structure; and
replacing the sacrificial epitaxial plug and the sacrificial epitaxial structure with a backside via.