Patent ID: 6159323
Filing Date: 2000-12-12
Classification: G02F,H01L,H05K

Abstract:
Process for the selective transfer of at least one microstructure (12) formed on a substrate (10) called the initial substrate, to another substrate (32) called the final substrate, the process comprises the following steps in sequence:a) preparing the initial substrate to enable reversible bonding, with an initial bond force, between the initial substrate (10) and a substrate (24) called the intermediate substrate,(b) bonding of the initial substrate (10) with the intermediate substrate (24), the microstructure facing the intermediate substrate,(c) forming a layer (30) of bond material on at least one selected region (16) of the initial substrate including the microstructure, and/or on a reception region (16') of the final substrate, the bond material having a bond capacity that may be locally increased by appropriate treatment,(d) contacting the said selected region (16) of the initial substrate with the reception region on the final substrate,(e) treating the layer of bond material in an area corresponding to the selected region (16) of the initial substrate, comprising the microstructure, to locally increase the bond force in this area to a value exceeding the initial bond force, to fix the said selected region (16) of the initial substrate onto the reception region (16') on the final substrate (32),(f) breaking the bond between the selected region (16) of the initial substrate, including the microstructure, and the intermediate substrate (24), wherein portions of the initial substrate remain bonded to the intermediate substrate.