Patent ID: 9735038
Date: 2017-08-15
CPC Classifications: H01L

Claim:
1. A method for manufacturing a structure which implements temporary bonding of a substrate to be handled with a handle substrate, comprising: providing the substrate to be handled covered with a first metal layer, the first metal layer having a first grain size; providing the handle substrate covered with a second metal layer, the second metal layer having same composition as the first metal layer and a second grain size different from the first grain size; assembling the substrate to be handled and the handle substrate by thermocompression assisted direct bonding of the first and second metal layers, said assembling resulting in an assembly which comprises the substrate to be handled assembled to the handle substrate through a bonding layer made of the first and second metal layers bonded together; and separating the assembly at an embrittlement zone to form the structure, the separating comprising an embrittlement thermal annealing of the assembly to form the embrittlement zone in one of the first and second metal layers which has the smallest grain size.