Device and method for bonding substrates
A method for bonding a contact surface of a first substrate to a contact surface of a second substrate comprising of the steps of: positioning the first substrate on a first receiving surface of a first receiving apparatus and positioning the second substrate on a second receiving surface of a second receiving apparatus; establishing contact of the contact surfaces at a bond initiation site; and bonding the first substrate to the second substrate along a bonding wave which is travelling from the bond initiation site to the side edges of the substrates, wherein the first substrate and/or the second substrate is/are deformed for alignment of the contact surfaces.
1. A device for bonding of a first substrate to a second substrate on respective contact surfaces of the substrates, the device comprising:
a first mounting apparatus configured to accommodate the first substrate on a first mounting surface, the first mounting apparatus being a lower mounting apparatus;
a second mounting apparatus configured to accommodate the second substrate on a second mounting surface the second mounting apparatus being an upper mounting apparatus;
contact means for bringing the contact surface of the first substrate into contact with the contact surface of the second substrate at a bond initiation site;
fixing means for fixing the first substrate and/or the second substrate solely in a region of side edges of the substrates on the first and/or second mounting surfaces; and
deformation means for deforming the first substrate and/or the second substrate for alignment of the contact surfaces outside the bond initiation site before and/or during the bonding, the deformation means comprising mechanical actuating means configured to mechanically actuate the first and/or second mounting apparatus, the mechanical actuating means comprising an actuating element of the first mounting apparatus, the actuating element being configured to actuate the first mounting surface of the first mounting apparatus to adjust a radius of curvature of the first mounting surface of the first mounting apparatus,
wherein a radius of curvature of the first substrate and a radius of curvature of the second substrate deviate only marginally from each other at least in a region at which the contact surfaces are brought into contact at a bond front of a bonding wave.
2. The device as claimed in claim 1 , wherein the radii of curvature of the substrates deviate from each other at the bond front less than 5%.
3. The device as claimed in claim 1 , wherein the radii of curvature of the substrates are the same at the bond front.
4. The device as claimed in claim 1 , wherein the deformation means is configured to encompass the first mounting apparatus, and
wherein the first mounting apparatus is deformable on the first mounting surface in a lateral direction, convexly, concavely, or in a combination of one or more thereof.
5. The device as claimed in claim 1 , wherein the deformation means is configured encompass the second mounting apparatus, and
wherein the second mounting apparatus is deformable on the second mounting surface in a lateral direction, convexly, concavely, or in a combination of one or more thereof.
6. The device as claimed in claim 1 , wherein the mechanical actuating means further comprises a pin of the second mounting apparatus, the pin being configured to mechanically actuate the second substrate to adjust the radius of curvature of the second substrate.
7. The device as claimed in claim 1 , wherein the actuating element comprises a pull rod and/or a push rod configured to actuate the first mounting surface of the first mounting apparatus to adjust a radius of curvature of the first mounting surface of the first mounting apparatus.