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    Performance, morphology and photophysics of high open-circuit voltage, low band gap all-polymer solar cells

    Access Status
    Fulltext not available
    Authors
    Deshmukh, K.
    Qin, T.
    Gallaher, J.
    Liu, A.
    Gann, E.
    O'Donnell, Kane
    Thomsen, L.
    Hodgkiss, J.
    Watkins, S.
    McNeill, C.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Deshmukh, K. and Qin, T. and Gallaher, J. and Liu, A. and Gann, E. and O'Donnell, K. and Thomsen, L. et al. 2015. Performance, morphology and photophysics of high open-circuit voltage, low band gap all-polymer solar cells. Energy and Environmental Science. 8 (1): pp. 332-342.
    Source Title
    Energy and Environmental Science
    DOI
    10.1039/c4ee03059a
    ISSN
    1754-5692
    School
    Department of Physics and Astronomy
    URI
    http://hdl.handle.net/20.500.11937/43844
    Collection
    • Curtin Research Publications
    Abstract

    The microstructure and photophysics of low-band gap, all-polymer photovoltaic blends are presented. Blends are based on the donor polymer BFS4 (a dithienyl-benzo[1,2-b:4,5-b]dithiophene/5-fluoro-2,1,3-benzothiadiazole co-polymer) paired with the naphthalene diimide-based acceptor polymer P(NDI2OD-T2). Efficiencies of over 4% are demonstrated, with an open circuit voltage of greater than 0.9 V achieved. Transmission electron microscopy reveals a relatively coarse phase-separated morphology, with elongated domains up to 200 nm in width. Near-edge X-ray absorption fine-structure (NEXAFS) spectroscopy and atomic force microscopy (AFM) measurements reveal that the top surface of BFS4:P(NDI2OD-T2) blends is covered with a pure BFS4 capping layer. Depth profiling measurements confirm this vertical phase separation with a surface-directed spinodal decomposition wave observed. Grazing-incidence wide-angle X-ray scattering (GIWAXS) measurements confirm that BFS4 and P(NDI2OD-T2) are semicrystalline with both polymers retaining their semicrystalline nature when blended. Photoluminescence spectroscopy reveals incomplete photoluminescence quenching with as much as 30% of excitons failing to reach a donor/acceptor interface. Transient absorption spectroscopy measurements also find evidence for rapid geminate recombination.

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