Patent ID: 8035163

Claim:
A method of manufacturing a double-structure substrate which comprises: providing a support substrate having a first insulating surface layer with a thickness of 50 nm to 1 micron; providing a crystalline donor substrate; forming, in succession, either a non-mono-crystalline, semi-conducting intermediate layer and a second insulating layer on the support substrate, or the second insulating layer and the non-mono-crystalline intermediate layer on the donor substrate, wherein the non-mono-crystalline intermediate layer is made of a semiconductor material that is of lower crystalline quality than that of the donor substrate and has a thickness between 20 nm and 200 nm, and the second insulating layer has a thickness of less than 25 nm; assembling the support substrate with the donor substrate so that the intermediate layer is sandwiched between the first and second insulating layers, and the intermediate layer and the first and second insulating layers are sandwiched between the two substrates; and reducing the thickness of the donor substrate portion of the assembled structure to provide a remaining portion of the donor substrate having a thickness of less than 100 nm as a top layer, thus forming the double-structure substrate.