Patent ID: 11916145
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B | IPC H

Claim 15:
16. A method, comprising:
forming a first stack of semiconductor layers on a substrate, wherein the first stack of semiconductor layers comprises:
first and second sets of semiconductor layers stacked in an alternate configuration;
an intermediate semiconductor layer on the first and second sets of semiconductor layers;
a substrate layer on the intermediate semiconductor; and
a capping semiconductor layer on the substrate layer;

replacing the intermediate semiconductor layer with a first isolation structure;
forming a first epitaxial layer on the first isolation structure and the first stack of semiconductor layers;
forming a second isolation structure on the first epitaxial layer;
forming a second epitaxial layer on the second isolation structure; and
forming a second stack of semiconductor layers on the second epitaxial layer.