| US 7,531,428 B2 | ||
| Recycling the reconditioned substrates for fabricating compound material wafers | ||
| Frederic Dupont, Grenoble (France) | ||
| Assigned to S.O.I.Tec Silicon on Insulator Technologies, Bernin (France) | ||
| Filed on Mar. 18, 2005, as Appl. No. 11/84,553. | ||
| Claims priority of application No. 04292655 (EP), filed on Nov. 09, 2004. | ||
| Prior Publication US 2006/0099776 A1, May 11, 2006 | ||
| Int. Cl. H01L 21/46 (2006.01) | ||
| U.S. Cl. 438—458 [438/406; 438/455; 438/459; 257/E21.568; 257/E21.122] | 19 Claims |

| 1. A method for fabricating compound material wafers, comprising:
providing a donor substrate having a surface;
forming a weakened zone in the donor substrate to define a transfer layer that includes the donor substrate surface;
bonding the surface of the transfer layer to a handle substrate;
detaching the donor substrate at the weakened zone to transfer the transfer layer onto the handle substrate thus forming a
compound material wafer, with the transfer layer detached, the donor substrate providing a remainder substrate having a first
surface where the transfer layer was detached;
epitaxially depositing an additional layer of a crystalline material onto a second surface of the remainder substrate to increase
the thickness of the remainder substrate to that of the initial donor substrate to form a reconditioned substrate, wherein
the second surface is positioned opposite to the first surface where detaching occurred;
providing an additional transfer layer on the first surface of the reconditioned substrate by forming a weakened zone therein
after depositing the additional layer; and
recycling the reconditioned substrate as a donor substrate for fabricating an additional compound material wafer that includes
the additional transfer layer.
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