Patent ID: 11908922
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A semiconductor structure, comprising:
a substrate comprising a first pyramid protrusion, a second pyramid protrusion, a third pyramid protrusion, and a fourth pyramid protrusion, wherein the first and second pyramid protrusions are arranged along a first direction, the second and fourth pyramid protrusions are arranged along the first direction, and the first and third pyramid protrusions are arranged along a second direction crossing the first direction, wherein a top surface of the first pyramid protrusion has a (100) crystal orientation;
a first epitaxial layer over the substrate and in contact with the first, second, third, and fourth pyramid protrusions, wherein the first epitaxial layer is a single piece of continuous material;
a second epitaxial layer over the first epitaxial layer, wherein the second epitaxial layer is a single piece of continuous material, and the first epitaxial layer is in contact with the substrate and the second epitaxial layer; and
a transistor over and partially embedded in the second epitaxial layer.