Patent ID: 7125458
Filing Date: 2006-10-24
Classification: C22F,H01L

Abstract:
1. A method of fabricating a SiGe-on-insulator substrate material comprising: providing a structure comprising a Si-containing substrate having a hole-rich region formed therein and a Ge-containing layer atop the Si-containing substrate, said providing includes one of (i) growing a p-rich epitaxial layer on an initial Si-containing substrate, forming a single crystal Si-containing layer atop the p-rich epitaxial layer, and forming the Ge-containing layer on the single crystal Si-containing layer, (ii) ion implanting a p-type dopant into an initial single crystal Si-containing substrate and then forming the Ge-containing layer on the substrate, or (iii) forming the Ge-containing layer on an initial single crystal Si-containing substrate and then implanting p-type dopant into the substrate to form said hole-rich region; converting the hole-rich region into a porous region; and annealing the structure including the porous region to provide a substantially relaxed SiGe-on-insulator material.