NOVELTY - A photovoltaic device (A1) (100) comprises a first component of a bulk heterojunction, where the first component is configured and dimensioned with a predetermined array of first structures (106); and each first structure is substantially equivalent in three dimensional shape and has a substantially equivalent cross-sectional dimension of less than 100 nm.    USE - As photovoltaic device (claimed) e.g. solar cells.    ADVANTAGE - The photovoltaic cells have deliberate or predetermined nano-scale morphology, and is fabricated in overall dimensions greater than a few square millimeters. In a polymer photovoltaic device, both active materials can exhibits a high optical absorption coefficient and can cover complementary parts of the solar spectrum. The polymer based photovoltaic device offers flexible, light weight, larger footprint, high fidelity structures layers, semi-transparency, low-cost fabrication, high-throughput fabrication, low temperature printing techniques, tunable properties of organic materials, to solar cell devices.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for forming a photovoltaic device involving providing a fluoropolymer mold having an array of substantially equivalently three dimensionally structured cavities; introducing a first material into the substantially equivalently three dimensionally structured cavities of the fluoropolymer mold; hardening the first material in the substantially equivalently three dimensionally structured cavities of the fluoropolymer mold; and removing the hardened first material from the substantially equivalently three dimensionally structured cavities of the fluoropolymer mold.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of the solar cells fabricated from arrayed nano-scale structures.    Photovoltaic device (100)    High workfunction electrode (102)    First interfacial layer (104)    Nano-structures (106)    Acceptor material (108)    Second interfacial layer (110)    Low work function electrode. (112)