Patent ID: 7459375
Filing Date: 2008-12-02
Classification: H01L,Y10S

Abstract:
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.