Patent ID: 11862467
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. A method of manufacturing a semiconductor structure, comprising:
providing a substrate;
forming a plurality of fin structures over the substrate;
forming an insulation material in a plurality of gaps between the fin structures;
forming a sacrificial layer on the fin structures and the insulation material;
applying a first ion implantation to the fin structures with a first implantation energy to form a first implanted region of the fin structures;
applying a second ion implantation to the fin structures with a second implantation energy to form a second implanted region of the fin structures;
applying a third ion implantation to the fin structures with a third implantation energy to form a third implanted region of the fin structures; and
removing at least a portion of the insulation material to expose at least a top surface of each fin structure,
wherein the first implantation energy is greater than the second implantation energy, and the second implantation energy is greater than the third implantation energy, and
wherein each of the plurality of ion-implantation cycles is applied with a tilt angle with respect to the vertical axis from about 5° to about 70°.