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• W2503037314 abstract "We investigate dipolar donor materials mixed with a ${mathrm{C}}_{70}$ acceptor in an organic photovoltaic (OPV) cell. Dipolar donors that have donor-acceptor-acceptor (d-a-aensuremath{'}) structure result in high conductivity pathways due to close coupling between neighboring molecules in the mixed films. We analyze the charge transfer properties of the dipolar donor:${mathrm{C}}_{70}$ mixtures and corresponding neat donors using a combination of time-resolved electroluminescence from intermolecular polaron pair states and conductive tip atomic force microscopy, from which we infer that dimers of the d-a-aensuremath{'} donors tend to form a continuous network of nanocrystalline clusters within the blends. Additional insights are provided by quantum-mechanical calculations of hole transfer coupling and hopping rates between donor molecules using nearest-neighbor donor packing motifs taken from crystal structural data. The approximation using only nearest-neighbor interactions leads to good agreement between donor hole hopping rates and the conductive properties of the donor:${mathrm{C}}_{70}$ blends. This represents a significant simplification from requiring details of the nano- and mesoscale morphologies of thin films to estimate their electronic characteristics. Using these dipolar donors, we obtain a maximum power conversion efficiency of $9.6ifmmodepmelsetextpmfi{}0.5%$ under 1 sun, AM1.5G simulated illumination for an OPV comprised of an active layer containing a dipolar donor mixed with ${mathrm{C}}_{70}$." @default.
• W2503037314 created "2016-08-23" @default.
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• W2503037314 date "2015-08-06" @default.
• W2503037314 modified "2023-10-13" @default.
• W2503037314 title "Charge transport and exciton dissociation in organic solar cells consisting of dipolar donors mixed withC70" @default.
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• W2503037314 doi "https://doi.org/10.1103/physrevb.92.085404" @default.
• W2503037314 hasPublicationYear "2015" @default.
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