Patent ID: 8575002

Claim:
A method for reducing overlay misalignment during the direct bonding of a first wafer having a first intrinsic curvature to a second wafer having a second intrinsic curvature, with at least the first wafer comprising at least one series of microcomponents thereon, which method comprises: contacting the wafers with each other so as to initiate the propagation of a bonding wave between the wafers, and imposing a predefined bonding curvature in the form of a paraboloid of revolution on one of the first or second wafers during the contacting, with the predefined bonding curvature depending at least upon the first intrinsic curvature of the first wafer comprising the at least one series of microcomponents thereon, with the other of the first or second wafers being free to conform to the predefined bonding curvature.