Patent ID: 8628674
Filing Date: 2014-01-14
Classification: H01L,Y10T

Abstract:
1. A method for assembly of two wafers comprising: a) providing a first wafer and a second wafer each with a chamfered edge region; b) forming a fragile zone inside the first wafer; c) bonding the first wafer and the second wafer, wherein no bonding occurs between the two wafers in the chamfered edge region of the first wafer and in the chamfered edge region of the second wafer; d) trimming the chamfered edge region of the first wafer where the no bonding occurs by etching, wherein the etching forms in the first wafer a pedestal resting entirely on a contact face of the second wafer and supporting a remaining of the first wafer; and e) thinning the first wafer until the pedestal is reached and attacked, wherein the thinning comprises fracturing the fragile zone of the first wafer, wherein bonding energy between the first wafer and the second wafer is taken into account to obtain a determined width of the trimming of the chamfered edge region of the first wafer.