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

Claim 17:
18. A method of forming a SOI substrate, comprising:
forming a bonded wafer structure having a dielectric-to-dielectric bonding interface, comprising:
forming a first dielectric layer on a carrier substrate;
forming a buffer layer embedded in a semiconductor substrate structure, wherein forming the buffer layer embedded in the semiconductor substrate structure comprises:
providing a substrate;
performing an epitaxial process to form the buffer layer on the substrate; and
forming a semiconductor cap on the buffer layer;
forming a sacrificial layer on the semiconductor substrate structure;
performing an implantation process to implant an implantation species through the semiconductor substrate structure into the buffer layer, the implantation species define a cleavage plane in the buffer layer, wherein the semiconductor substrate structure is protected while performing the implantation process;
removing the sacrificial layer;
forming a second dielectric layer on the semiconductor substrate structure after performing the implantation process; and
bonding the second dielectric layer to the first dielectric layer; and
performing a wafer splitting process along the cleavage plane in the buffer layer.