Inorganic nanocomposites for the next generation photovoltaics

Abstract Photovoltaic is an attractive alternative of conventional energy source, but for the limitations of present materials and technology, we need to find out cost effective and environmentally stable new materials. We have synthesized a novel nanocomposite, named titania–germanium (TiO 2 –Ge). TiO 2 –Ge is a thermodynamically stable material. Ge nanodots are dispersed in the TiO 2 matrix of the nanocomposites. Bohr radius of Ge is relatively large, 24.3 nm, therefore, it is easy to vary the size of Ge nanodots, and consequently the properties (structural, optical and electrical) of TiO 2 –Ge can be tailored in a wide range just by varying the size and density of Ge nanodots. TiO 2 –Ge with size gradient of Ge nanodots is a promising active layer of the next generation solar cells.