Patent ID: 8153500
Filing Date: 2012-04-10
Classification: H01L

Abstract:
1. A method of fabricating material by epitaxy, which comprises epitaxially growing at least one layer of a material on a composite structure comprising at least one thin film bonded to a support substrate, a bonding layer of oxide formed by deposition between the support substrate and the thin film, with the thin film and the support substrate having a mean thermal expansion coefficient of 7×10 −6 K −1 or more in a temperature range of 20° C. to 1200° C., wherein the bonding layer of oxide is formed by low pressure chemical vapor deposition (LPCVD) of a layer of silicon oxide on either a bonding face of the support substrate or a bonding face of the thin film, or both, wherein the thin film has a thickness that is less than or equal to the thickness of the bonding layer of oxide, wherein the method includes a heat treatment carried out during or after the epitaxial growing of the layer of material and at a temperature that is higher than that used for depositing the layer of oxide, with the heat treatment being applied with a thermal budget that can at least initiate the forming of microcavities in the bonding layer in order to weaken the bond between the support substrate and the thin film.