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    End Group Tuning in Acceptor–Donor–Acceptor Nonfullerene Small Molecules for High Fill Factor Organic Solar Cells

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    Type
    Article
    Authors
    Wadsworth, Andrew
    Bristow, Helen
    Hamid, Zeinab
    Babics, Maxime
    Gasparini, Nicola
    Boyle, Colm W.
    Zhang, Weimin
    Dong, Yifan
    Thorley, Karl J.
    Neophytou, Marios
    Ashraf, Raja Shahid
    Durrant, James R.
    Baran, Derya cc
    McCulloch, Iain cc
    KAUST Department
    Chemical Science
    Chemical Science Program
    KAUST Solar Center
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2019-06-11
    Embargo End Date
    2020-01-01
    Permanent link to this record
    http://hdl.handle.net/10754/656291
    
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    Abstract
    High fill factors have only recently become commonplace in nonfullerene-based organic solar cells, with the balance of charge carrier mobilities often cited as the contributing factor. Here an end-group modification to a commonly used nonfullerene acceptor (O-IDTBR) is reported, in which the rhodanine end groups are replaced with dicyano moieties, resulting in the acceptor O-IDTBCN. This new acceptor affords significant improvement in the fill factor (73%) and photocurrent (19.8 mA cm−2) in organic solar cells with the low bandgap polymer PTB7-Th. A narrowing of the bandgap, as a result of greater push–pull hybridization, allows complementary absorption to the donor and thus improved photon harvesting. Additionally, the measurement of charge carrier mobilities and lifetimes in both systems reveal that the PTB7-Th:O-IDTBCN blend possesses more balanced charge carrier mobilities, and longer lifetimes. Morphology studies reveal a slightly greater degree of molecular mixing of the O-IDTBCN when blended with PTB7-Th, despite the greater and more balanced charge carrier mobilities in this blend.
    Citation
    Wadsworth, A., Bristow, H., Hamid, Z., Babics, M., Gasparini, N., Boyle, C. W., … McCulloch, I. (2019). End Group Tuning in Acceptor–Donor–Acceptor Nonfullerene Small Molecules for High Fill Factor Organic Solar Cells. Advanced Functional Materials, 29(47), 1808429. doi:10.1002/adfm.201808429
    Sponsors
    The authors thank KAUST for financial support, the Welsh Assembly Government Ser Solar Project, and acknowledge EC FP7 Project SC2 (610115), EC H2020 (643791), and EPSRC Projects EP/G037515/1, EP/M005143/1, and EP/L016702/1.
    Publisher
    Wiley
    Journal
    Advanced Functional Materials
    DOI
    10.1002/adfm.201808429
    Additional Links
    https://onlinelibrary.wiley.com/doi/abs/10.1002/adfm.201808429
    ae974a485f413a2113503eed53cd6c53
    10.1002/adfm.201808429
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; Material Science and Engineering Program; KAUST Solar Center (KSC)

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