Patent ID: 6982208

Claim:
A method for forming a strained silicon layer device with improved wafer throughput and low defect density comprising the steps of: epitaxially growing a first silicon layer on a silicon substrate using at least one deposition precursor selected from the group consisting of disilane and trisilane; epitaxially growing a step-grade SiGe-containing buffer layer over and contacting the first silicon layer using at least one deposition precursor selected from the group consisting of disilane and trisilane; epitaxially growing a SiGe-containing capping layer over and contacting the step-grade SiGe-containing buffer layer using at least one deposition precursor selected from the group consisting of disilane and trisilane; and, epitaxially growing a second silicon layer using at least one deposition precursor selected from the group consisting of disilane and silane.