Patent ID: 7135699

Claim:
A semiconductor crystalline device, comprising: a single crystal substrate comprising first and second surfaces; and one or more superlattices comprising one or more repeating units each comprising a plurality of layers, wherein at least one of the layers in the one or more repeating units is a substantially single crystal active layer of a composition [X] w [RE] x [J1] y [J2] z wherein [RE] is chosen from a group comprising 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 Luthium (Lu), [X] is chosen from a group comprising silicon, germanium and SiGe mixtures, [J1] and [J2] are chosen from a group comprising Oxygen (O), Nitrogen (N), and Phosphorus (P), x varies from greater than 0 to ≦3 and 0≦w, y, z≦3.