NOVELTY - A composition comprises a composite material including a polymeric phase and nanoparticle phase, the nanoparticle phase comprising at least one exaggerated nanocrystalline grain.    USE - In photovoltaic cells for photoactive apparatus including solar collector, which is useful for converting electromagnetic energy into electrical energy (claimed); in optoelectronic devices including organic light emitting devices, photovoltaic devices, and organic photodetectors.    ADVANTAGE - The composite materials permit efficient absorption of electromagnetic radiation while reducing exciton recombination; and absorb electromagnetic radiation to produce excitons in the composite material.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a photovoltaic cell (200) comprising a radiation transmissive first electrode (204); and a photosensitive composite organic layer (208) electrically connected to the first electrode, where the organic layer containing the polymeric phase and the nanoparticle phase;    (2) a photoactive apparatus comprising at least one pixel including at least one of the photovoltaic cell;    (3) producing a composite material involving disposing a nanoparticle phase in a polymeric phase; and forming at least one exaggerated nanocrystalline grain in the polymeric phase;    (4) producing a photovoltaic cell involving disposing the photosensitive composite organic layer in electrical communication with a radiation transmissive first electrode; disposing a second electrode in electrical communication with the organic layer; and forming at least one exaggerated nanocrystalline grain in the polymeric phase of the organic layer; and    (5) a method (M1) of converting electromagnetic energy into electrical energy involving exposing the photosensitive composite organic layer to electromagnetic radiation; generating excitons in the organic layer; and separating the excitons into electrons and holes at a heterojunction in the composite organic layer.    DESCRIPTION OF DRAWING(S) - The figure shows a photovoltaic cell.    Photovoltaic cell (200)    Radiation transmissive substrate (202)    Radiation transmissive first electrode (204)    Exciton blocking layer (206)    Photosensitive composite organic layer (208)    Second electrode. (210)