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
OG exemplary drawing
 
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.