Patent ID: 7387947
Filing Date: 2008-06-17
Classification: H01L

Abstract:
1. A method for transferring a thin useful layer from a donor substrate having an ordered crystalline structure to a receiver substrate, the method including creation of a weakened zone in the donor substrate to define the thin layer to be transferred from the donor substrate, wherein the method comprises: disturbing the crystalline structure of a surface region of the donor substrate so as to create a disturbed superficial region within the thickness of the donor substrate, and thus define a disturbance interface between the disturbed superficial region and a subjacent region of the donor substrate for which the crystalline structure remains unchanged, subjecting the donor substrate to a recrystallization annealing in order to: introducing one or several species into the thickness of the donor substrate to create the weakened zone, with the species being introduced with introduction parameters that are adjusted to introduce a maximum number of species at the weakened zone at a depth that corresponds to that of the zone of crystalline defects.