Patent ID: 11955384
Assignee: NATIONAL TAIWAN UNIVERSITY
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B | IPC H

Claim 6:
7. A method comprising:
forming a fin structure over a substrate, wherein the fin structure comprises a first channel layer, a sacrificial layer over the first channel layer, and a second channel layer over the sacrificial layer;
forming a first source/drain epitaxial structure over the substrate and connected to the first channel layer;
epitaxially growing an epitaxial isolation structure to surround the first source/drain epitaxial structure, comprising:
epitaxially growth a first semiconductive layer to surround the first source/drain epitaxial structure;
epitaxially growth a second semiconductive layer to surround the first semiconductive layer, wherein the first semiconductive layer and the second semiconductive layer have opposite conductivity types;

forming a second source/drain epitaxial structure over the epitaxial isolation structure and connected to the second channel layer; and
replacing the sacrificial layer with a gate structure.