Patent ID: 8241998
Filing Date: 2012-08-14
Classification: H01L

Abstract:
1. A method of manufacturing an ultra-thin-buried-insulating-layer-type of semiconductor-on-insulator (SOI) structure having an insulating layer of increased permittivity and increased thickness but substantially equivalent capacitance in comparison to a buried layer of silicon dioxide in a conventional UTBOX SOI structure wherein the buried layer is less than 30 nm thick, which method comprises: forming at least one dielectric layer of a high k material on either of a donor substrate or a receiving substrate or on both substrates, with the dielectric layer having a permittivity that is higher than that of silicon dioxide and having an increased thickness selected so that the capacitance of the dielectric layer is substantially equivalent to that of the buried layer of silicon dioxide in the conventional UTBOX SOI structure; forming an embrittlement plane in the donor substrate that defines a thin, useful layer of the donor substrate for transfer to the receiving substrate; bonding the donor and receiving substrates together at a bonding interface with the dielectric layer(s) positioned between the substrates; and detaching the thin, useful layer by cleaving at the embrittlement plane to form a semiconductor-on-insulator structure that has a buried insulating layer of the high k dielectric material.