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

Claim 0:
1. A method of forming a semiconductor-on-insulator (SOI) substrate, comprising:
forming a first dielectric layer on a first substrate;
forming a buffer layer on a second substrate;
forming a semiconductor cap on the buffer layer over the second substrate;
forming a sacrificial layer on the semiconductor cap;
forming a cleavage plane in the buffer layer;
removing the sacrificial layer;
forming a second dielectric layer on the semiconductor cap after forming the cleavage plane;
bonding the second dielectric layer on the second substrate to the first dielectric layer on the first substrate;
performing a splitting process along the cleavage plane in the buffer layer;
removing a first split buffer layer from the semiconductor cap, wherein after removing the first split buffer layer, the first substrate, a dielectric bonding structure comprising the first dielectric layer and the second dielectric layer, and the semiconductor cap constitute the SOI substrate, wherein the SOI substrate comprises a dielectric-to-dielectric bonding interface between the first dielectric layer and the second dielectric layer; and
removing a second split buffer layer from the second substrate.