Patent ID: 11881533
Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B | IPC H

Claim 0:
1. A method for fabricating a semiconductor device, the method comprising:
forming a sacrificial structure on an insulating layer on a semiconductor substrate, the sacrificial structure comprises a seed material;
forming a coating layer surrounding an upper horizontal surface and vertical side surfaces of the seed material;
forming an opening encompassing a fixed central position of the seed material, by removing a portion of the insulating layer below the seed material and by removing a portion of the coating layer from an upper horizontal surface and vertical side surfaces surrounding the fixed central position;
reducing a cross section of the fixed central position of the seed material by performing a controlled oxidation of the seed material at the fixed central position of the seed material;
selectively removing a first portion of the seed material to form a first cavity structure, exposing a first surface of the seed material at the fixed central position of the seed material, on a first side of the fixed central position of the seed material;
growing, within the first cavity structure, a quantum dot structure in a first growth direction from the first surface of the seed material;
growing, in the first growth direction, a first embedding layer on a first surface of the quantum dot structure;
selectively removing a remaining portion of the seed material to form a second cavity structure, exposing a second surface of the quantum dot structure on a second side of the fixed central position of the seed material; and
growing, within the second cavity structure, on the second surface of the quantum dot structure, a second embedding layer in a second growth direction, wherein the second surface of the quantum dot structure is different from the first surface of the quantum dot structure and the second growth direction is different from the first growth direction.