Patent ID: 8106381

Claim:
A solid state device comprising a structure comprising; a first region substantially single crystal of first crystallographic orientation and first composition; a second region substantially single crystal of second crystallographic orientation and second composition; and a third region substantially single crystal of third crystallographic orientation and third composition separated from the first region by the second region; wherein the second region is in contact with the first and third regions and comprises at least one rare-earth metal compound such that the third crystallographic orientation is different from the first crystallographic orientation and wherein the first and third compositions consist of group IV elements and the second composition is described by [RE1] v [RE2] w [RE3] x [J1] y [J2] z wherein [RE] is chosen from a group consisting of the lanthanide series plus yttrium; [J1] and [J2] are chosen from a group consisting of Oxygen (O) and Phosphorus (P), and 0≦v, w, z≦5, and 0<x, y≦5 such that the lattice spacing of the second composition introduces predetermined strain into the first and third regions.