Patent ID: 8349703

Claim:
A method for reducing edge voids and blisters when forming a structure comprising a thin layer of semiconductor material transferred from a donor substrate onto a second substrate, which method comprises: co-implanting two different atomic species into the donor substrate so as to create a weakened zone delimiting the thin layer to be transferred, each of the species having a maximum concentration at a so-called “peak” depth, with the two different atomic species implanted so that their peaks are aligned at substantially identical depths; and molecularly bonding the donor and second substrates together by: cleaning the surface of one or both of the substrates by means including a chemical bath under conditions selected so that the surface is etched by less than 10 Å to avoid blister formation during subsequent bonding wave propagation; heating at least one or both of the substrates to a temperature in the range of 45° C. to 70° C. then contacting the substrates; propagating a bonding wave between the substrates while retaining the substrate temperature in the range of 45° C. to 70° C. to reduce or eliminate edge voids during bonding wave propagation; and transferring part of the donor substrate to the second substrate so as to form the thin layer on the second substrate.