NOVELTY - A photovoltaic nanocomposite nanostructured material comprises first and second nanostructured materials; intermixed region between the nanostructured materials; first electron affinity and first ionization potential for the first nanostructured material; second electron affinity and second ionization potential for the second nanostructured material; and optical absorption coefficient of greater than or equal to103/cm for light comprised of wavelengths within 400-700 nm describing the first or second nanostructured material.    USE - For photovoltaic device (claimed).    ADVANTAGE - The material provides improved performance for photovoltaic devices.    DETAILED DESCRIPTION - The photovoltaic nanocomposite nanostructured material comprises first and second nanostructured materials; intermixed region between the nanostructured materials; first electron affinity and first ionization potential for the first nanostructured material; second electron affinity and second ionization potential for the second nanostructured material, the first electron affinity being less than the second electron affinity and the first ionization potential being less than the second ionization potential, and the second electron affinity being less than that the first ionization potential; and optical absorption coefficient of greater than or equal to103/cm for light comprised of wavelengths within 400-700 nm describing the first or second nanostructured material. INDEPENDENT CLAIMS are included for:    (1) a photovoltaic device; and    (2) a method of forming a photovoltaic composite material.    The first and second nanostructured materials are Group IV semiconductor materials and Group IV-IV semiconductor materials. The first nanostructured material is comprised of silicon nanostructures and silicon germanium alloys nanostructures, and the second nanostructured material is comprised of germanium nanostructures. The first and second nanostructured materials are metal oxides. The first nanostructured material is copper oxide or iron oxide and the second nanostructured material is zinc oxide, titanium dioxide, tin dioxide, or tungsten oxide.    DESCRIPTION OF DRAWING(S) - The figure is a simplified diagram illustrating an intermixed region of the photovoltaic device.