Patent ID: 8343850

Claim:
A process for fabricating a substrate with a buried oxide layer for the production of electronic components, which comprises: depositing an oxide or nitride layer on either a donor substrate or a receiver substrate; bonding the donor and receiver substrates together with the oxide or nitride layer therebetween at a bonding interface; conducting a first heat treatment of the oxide or nitride layer after it is deposited on the donor or receiver substrate and before bonding the substrates together, wherein the first heat treatment includes applying a temperature of 600 to 1000° C. during a few minutes to a few hours in a non-oxidizing inert gas or inert gas mixture; and conducting a second heat treatment of a substrate that includes the receiver substrate, the oxide layer and all or part of the donor substrate; wherein the second heat treatment is a densification heat treatment that is conducted at a higher temperature than the first heat treatment with the heat treatments providing reinforcing of the bonding interface.