NOVELTY - A solar cell (100) comprises: a first electrode (110); an array of electron conducting nanostructure films (115) electrically coupled to and supported by the first electrode; several nanocrystalline light absorbers (120) attached to the electron conductive nanostructure films; a hole conducting material (125) disposed between the electron conducting nanostructure films; and a second electrode (130) electrically coupled to the hole conducting material.    USE - As solar cell (claimed).    ADVANTAGE - By forming or growing the light absorbers directly on the electron conducting film structures, the nanocrystalline light absorbers become attached to the surface of the electron conducting structures and form efficient electron conduction paths, allowing transport without significant recombination. Limiting electronic recombination enhances the device performance and utility. The film comprises an ordered array of nanowires and/or nanotubes that have a partially uniform nano-pore structure that allows better penetration for the hole conducting medium and growth path or attachment path for the nanocrystalline light absorbing material. Such a nanowire or nanotube film provides ordered nanostructures that serve as electron conductors. The nanostructures have a more continuous and straight crystalline structure that provides a straightforward path for electron transport. Such nanostructures also provide pore structures that are inverted with respect to flat films. Such pore structures are easier for hole conducting material to infiltrate, thus provides a similarly efficient transport path for holes and application of hole conducting material.    DETAILED DESCRIPTION - A solar cell (100) comprises: a first electrode (110); an array of electron conducting nanostructure films (115) electrically coupled to and supported by the first electrode; several nanocrystalline light absorbers (120) attached to the electron conductive nanostructure films; a hole conducting material (125) disposed between the electron conducting nanostructure films; and a second electrode (130) electrically coupled to the hole conducting material. The hole conductor comprises a porous material having open pores, and a hole conductive fluid. The hole conductive fluid comprises at least one of an aqueous electrolyte, ionic liquid, gel electrolytes, and polymers. An INDEPENDENT CLAIM is included for a method involving: synthesizing an ordered electron conductive nanostructure array on a transparent conducting electrode; growing light absorbing nanostructures onto the ordered conductive nanostructure array; adding a hole conducting material such that the hole conducting material infiltrates the nanostructure array; and providing a reflective conducting electrode that is electrically coupled to the hole conducting material.    DESCRIPTION OF DRAWING(S) - The figure shows a block cross section diagram of a nano-structure solar cell.    Nano-structured solar cell (100)    First electrode (110)    Electrically conductive nanostructure films (115)    Nanocrystalline light absorber (120)    Hole conducting material (125)    Second electrode (130)