Patent ID: 7256101
Filing Date: 2007-08-14
Classification: H01L

Abstract:
1. A method for preparing a semiconductor assembly, which comprises: providing a support substrate having a surface thereon; providing a donor substrate having a weakened zone that defines a useful layer and having a surface on the useful layer; providing an interface layer of a predetermined material on the surface of either the support substrate or the useful layer to provide a bonding surface thereon; molecularly bonding the bonding surface of the interface layer to the surface of the support substrate or the surface of the useful layer to form a separable bonding interface therebetween, and to thus form the semiconductor assembly; and heat treating the semiconductor assembly to a temperature of at least 1000° C. to 1100° C. without substantially increasing molecular bonding between the bonding surface of the interface layer and the surface of the support substrate or the surface of the useful layer so that the separable bonding interface maintains a sufficiently weak bond that can later be overcome by applying stresses to detach the useful layer from the donor substrate.