Patent ID: 7645517

Claim:
A semiconductor-on-insulator structure comprising: a substrate layer comprising a first surface; a single crystal semiconductor layer; and an insulator layer interposed between the substrate layer and the semiconductor layer, the insulator layer comprising first and second component layers wherein each component layer comprises at least one material combination chosen from: [Q] or [Q][RE] or [RE][J] wherein [RE] is chosen from a group consisting of Lanthanum (La), Cerium (Ce), Praseodymium (Pr), Neodymium (Nd), Promethium (Pm), Samarium (Sm), Europium (Eu), Gadolinium (Gd), Terbium (Tb), Dysprosium (Dy), Holmium (Ho), Erbium (Er), Thulium (Tm), Ytterbium (Yb) and Lutetium (Lu); [Q] is chosen from a group consisting of silicon, germanium and SiGe mixtures; [J] is chosen from a group consisting of Oxygen (O), and Nitrogen (N) such that the insulating layer is at least 90% single crystal and at least one component layer comprises a rare earth wherein the first component layer is in contact with the first surface and is polycrystalline or single crystal.