Patent ID: 7427773

Claim:
A multi layer substrate for use in forming integrated circuits comprising: a silicon containing substrate; an epitaxial graded Si 1−x Ge x layer disposed on said silicon containing substrate, wherein the value of x ranges from zero to 0.5; a relaxed Si 1−y Ge y layer disposed on said epitaxial graded Si 1−x Ge x layer; an encapsulation layer disposed on said relaxed Si 1−y Ge y layer and comprising a material selected from the group consisting of Poly Si, Si 3 N 4 , low-k dielectric materials having a dielectric constant less than SiO 2 , Diamond Like Carbon (DLC), Fluorinated Diamond Like Carbon (FDLC), a polymer of Si, C, O, and H and a combination of any two or more of the foregoing materials; and a second substrate bonded to said encapsulation layer, wherein said relaxed Si 1−y Ge y layer is free of hydrogen implant.