| US 7,459,375 B2 | ||
| Transfer method for forming a silicon-on-plastic wafer | ||
| Jer-Shen Maa, Vancouver, Wash. (US); Jong-Jan Lee, Camas, Wash. (US); Douglas J. Tweet, Camas, Wash. (US); and Sheng Teng Hsu, Camas, Wash. (US) | ||
| Assigned to Sharp Laboratories of America, Inc., Camas, Wash. (US) | ||
| Filed on Aug. 10, 2007, as Appl. No. 11/891,502. | ||
| Application 11/891502 is a division of application No. 10/913677, filed on Aug. 05, 2004, granted, now 7,279,400. | ||
| Prior Publication US 2007/0298588 A1, Dec. 27, 2007 | ||
| Int. Cl. H01L 21/44 (2006.01) | ||
| U.S. Cl. 438—455 [438/458; 438/459; 438/475; 438/558; 257/E21.482; 257/E21.568] | 18 Claims |

| 1. A method of fabricating a silicon-on-plastic layer via layer transfer comprising:
preparing a silicon substrate;
depositing a layer of SiGe on the silicon substrate;
depositing a layer of insulator on the SiGe layer;
implanting hydrogen ions into the silicon substrate through the SiGe layer in a relaxation hydrogen implantation step;
annealing the silicon substrate and SiGe layer in a first annealing step to relax the SiGe layer; thereby forming a relaxed
SiGe layer;
smoothing the relaxed SiGe layer;
depositing a layer of silicon on the relaxed SiGe layer;
implanting hydrogen ions in a splitting hydrogen implantation step to facilitate splitting of the wafer;
preparing a glass substrate;
bonding the glass substrate to the strained silicon layer to form a composite wafer;
splitting the composite wafer to provide a split wafer having, in seriatim, a glass substrate, a layer of strained silicon;
a layer of relaxed SiGe; and silicon layer split from the silicon substrate;
dry etching the split wafer to remove the silicon layer split from the silicon substrate and a portion of the relaxed SiGe
layer;
annealing the split wafer to increase the bond between the strained silicon and the glass substrate in a second annealing
step;
selectively etching the split wafer to remove any remaining SiGe, thereby forming a strained silicon-on-glass wafer;
depositing a dielectric on the silicon side of the silicon-on-glass wafer;
preparing a plastic substrate;
applying adhesive and bonding the plastic to the silicon side of the silicon-on-glass wafer;
removing the glass from the glass side of the bonded, silicon-on-glass wafer to form a silicon-on-plastic wafer; and
completing a desired IC device on the silicon-on-glass wafer.
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