Patent ID: 11961915
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B | IPC H

Claim 18:
19. A method of forming a semiconductor transistor device, the method comprising:
forming a fin structure over a substrate by alternately stacking first semiconductor layers and second semiconductor layers;
forming a gate structure to cover a first portion of the fin structure and to leave a second portion of the fin structure uncovered;
removing the second portion of the fin structure;
forming a first source/drain epitaxial structure and a second source/drain epitaxial structure on opposite endings of the fin structure which corresponded to the second portion of the fin structure;
removing the substrate to expose the first source/drain epitaxial structure or the second source/drain epitaxial structure; and
forming a back-side source/drain contact under and contacting the first source/drain epitaxial structure or the second source/drain epitaxial structure.