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Organic photovoltaic cells with nano-fabric heterojunction structure
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Organic photovoltaiccells containing electron-transporting organic nanofibers in the form of “nanofabrics” are investigated. Nano-fabric heterojunctions of poly(3-hexylthiophene) and electron-transporting nanofibers significantly improve short-circuit current density in organic photovoltaiccells. The nanofibers and nanofabric are synthesized from organic electron-transporting material bis(octyl)-perylenediimide (PDI-C8). The PDI-C8 based nano-fabric’s electron mobility is measured to be 0.08 cm2/V s. The nanofabric improves charge collection by expanding the interfacial acceptor-donor area while simultaneously providing dedicated electron transport pathways to the LiF/Al electrodes. An increase in fill factor is observed for photovoltaic cells incorporating the nanofabric heterojunctions and is attributed to efficient removal of space charge.
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