Patent ID: 7294557

Claim:
A method for transferring a first substrate to a second substrate, which comprises: molecularly bonding to each other first and second front faces of first and second substrates, respectively, to provide a composite structure, the first and second front faces being substantially parallel and corresponding in surface shape, the first front face having a first outline, the second front face having a second outline, and a peripheral side of the second substrate substantially bordering the second front face and being oriented generally perpendicularly with respect thereto; wherein during bonding, for improving bonding in a region at the periphery of the first front face: the second outline has dimensions larger than the first outline, such that at least a portion of the first outline is disposed within the second outline, and the first substrate comprises: a primary chamfer extending around and at an angle to the first front face and having a primary chamfer outline that is at least partially disposed within the second outline, and a secondary chamfer extending between and at an angle to each of the first front face and the primary chamfer.