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Fiber based organic photovoltaic devices
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15.Note that, because the active organic layers in OPV cells are typically thinner than the wavelength of incident light, optical microcavity effects are important in interpreting organic PV cell performance. Extended optical models (not shown here) accurately predict how PV cell performance changes with illumination conditions, as well as variations in the thickness of the cathode (Refs. 18 and 19). Particularly in the case of metal-organic-metal layer structures, planar devices optimized for illumination at normal incidence are not optimized for oblique incidence angles. The planar cell in this work, for example, was optimized for normal illumination, and variation of efficiency with angle may differ for OPV cells made on ITO glass (Ref. 16).
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A fiber-shaped organic photovoltaiccell is demonstrated, utilizing concentric thin films of small molecular organic compounds. Illuminated at normal incidence to the fiber axis through a thin metal electrode, the cell exhibits 0.5% power conversion efficiency, compared to 0.76% for a planar control device. The fiber device efficiency is nearly independent of illumination angle, increasing its power generation over the planar counterpart for diffuse illumination. Losses due to partial shading of the fiber surface are minimal, while the coated fiber length is limited only by the experimental deposition chamber geometry—factors favoring scale-up to woven energy harvesting textiles.
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