Patent ID: 7811382
Filing Date: 2010-10-12
Classification: C30B,H01L

Abstract:
1. A method for making a semiconductor structure, comprising: providing a donor wafer comprising: epitaxially growing a first silicon layer on the SiGe buffer layer to a thickness of less than 200 Angstroms, wherein the first silicon layer has tensile strain; forming a first dielectric layer on the first silicon layer; performing an implant to form a cleave line in the SiGe buffer layer; providing a handle wafer comprising: bonding the second dielectric layer to the first dielectric layer; cleaving the SiGe buffer layer along the cleave line to leave the first dielectric layer, the first silicon layer, and a portion of the SiGe buffer layer attached to the handle wafer; removing the portion of the SiGe layer to expose the first silicon layer; epitaxially growing silicon on the first silicon layer by applying trisilane at a temperature below 650 degrees Celsius to form a low temperature silicon layer on the first silicon layer to a thickness in excess of 300 Angstroms, wherein the low temperature silicon layer has tensile strain; and forming a transistor having a gate over the low temperature silicon layer, a first source/drain in the low temperature silicon layer, and a second source/drain in the low temperature in the low temperature silicon layer, wherein the gate is over a space between the first and second source/drains.