Patent ID: 11955374
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. A method of forming a SOI substrate, comprising:
forming a first initial wafer structure, comprising:
forming a first dielectric layer on a first substrate;
forming a second initial wafer structure, comprising:
forming a buffer layer on a second substrate;
forming a semiconductor cap on the buffer layer;
forming a sacrificial layer on the semiconductor cap;
performing an implanting process to implant an implantation species through the sacrificial layer into the buffer layer, so as to define a cleavage plane in the buffer layer, after performing the implantation process, a concentration of the implantation species comprised in the semiconductor cap is less than a concentration of the implantation species comprised in the second substrate;
removing the sacrificial layer; and
forming a second dielectric layer on the semiconductor cap;
bonding the second dielectric layer of the second initial wafer structure to the first dielectric layer of the first initial wafer structure;
performing a wafer splitting process along the cleavage plane in the buffer layer; and
after performing the wafer splitting process, performing a post annealing process during which implant induced defects in the semiconductor cap are healed, and the semiconductor cap is free of the implantation species.