Patent ID: 6991956
Filing Date: 2006-01-31
Classification: H01L

Abstract:
1. A method for transferring a layer of semiconductor material from a wafer that comprises a support substrate and an upper surface that includes a buffer layer of a material having a first lattice parameter, which method comprises: growing a strained layer on the buffer layer, wherein the strained layer is made of a semiconductor material having a nominal lattice parameter that is substantially different from the first lattice parameter and is grown to a thickness that is sufficiently thin to avoid relaxation of the strain therein; growing a relaxed layer on the strained layer, wherein the relaxed layer comprises silicon and a concentration of at least one other semiconductor material and the relaxed layer has a nominal lattice parameter that is substantially identical to the first lattice parameter of the buffer layer; providing a weakened zone in the buffer layer and supplying energy to detach, at the weakened zone, a structure comprising a portion of the buffer layer, the strained layer and the relaxed layer; and enriching the concentration of the at least one other semiconductor material in the relaxed layer of the structure.