Patent ID: 7064037

Claim:
A method of forming a semiconductor layer with tensile strain, comprising the steps of: providing a semiconductor substrate; forming a first type semiconductor alloy layer on said semiconductor substrate; forming a second type semiconductor alloy layer on said first type semiconductor alloy layer, resulting in a composite layer comprised of overlying, said second type semiconductor alloy layer on said first type semiconductor alloy layer; forming multiple composite layers on underlying said composite layer, with each composite layer of said multiple composite layers comprised with an overlying second type semiconductor alloy layer and of an underlying first type semiconductor alloy layer; forming a thick second type semiconductor alloy layer; performing an anneal procedure insitu in an hydrogen ambient resulting in an overlying composite layer comprised with a relaxed second type semiconductor alloy layer; and forming said semiconductor layer via LPCVD or MBE procedures wherein said semiconductor layer is formed under tensile strain on underlying, said thick second type semiconductor alloy and wherein said semiconductor layer is formed in same apparatus used for formation of said thick second type semiconductor alloy layer and for said anneal procedure.