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    A rhodanine flanked nonfullerene acceptor for solution-processed organic photovoltaics

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    Type
    Article
    Authors
    Holliday, Sarah
    Ashraf, Raja Shahid
    Nielsen, Christian Bergenstof
    Kirkus, Mindaugas cc
    Röhr, Jason A.
    Tan, Chinghong
    Collado-Fregoso, Elisa
    Knall, Astrid Caroline
    Durrant, James R. cc
    Nelson, Jenny K.
    McCulloch, Iain cc
    KAUST Department
    Chemical Science Program
    KAUST Solar Center (KSC)
    Physical Science and Engineering (PSE) Division
    Date
    2015-01-12
    Online Publication Date
    2015-01-12
    Print Publication Date
    2015-01-21
    Permanent link to this record
    http://hdl.handle.net/10754/564016
    
    Metadata
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    Abstract
    A novel small molecule, FBR, bearing 3-ethylrhodanine flanking groups was synthesized as a nonfullerene electron acceptor for solution-processed bulk heterojunction organic photovoltaics (OPV). A straightforward synthesis route was employed, offering the potential for large scale preparation of this material. Inverted OPV devices employing poly(3-hexylthiophene) (P3HT) as the donor polymer and FBR as the acceptor gave power conversion efficiencies (PCE) up to 4.1%. Transient and steady state optical spectroscopies indicated efficient, ultrafast charge generation and efficient photocurrent generation from both donor and acceptor. Ultrafast transient absorption spectroscopy was used to investigate polaron generation efficiency as well as recombination dynamics. It was determined that the P3HT:FBR blend is highly intermixed, leading to increased charge generation relative to comparative devices with P3HT:PC60BM, but also faster recombination due to a nonideal morphology in which, in contrast to P3HT:PC60BM devices, the acceptor does not aggregate enough to create appropriate percolation pathways that prevent fast nongeminate recombination. Despite this nonoptimal morphology the P3HT:FBR devices exhibit better performance than P3HT:PC60BM devices, used as control, demonstrating that this acceptor shows great promise for further optimization.
    Citation
    Holliday, S., Ashraf, R. S., Nielsen, C. B., Kirkus, M., Röhr, J. A., Tan, C.-H., … McCulloch, I. (2015). A Rhodanine Flanked Nonfullerene Acceptor for Solution-Processed Organic Photovoltaics. Journal of the American Chemical Society, 137(2), 898–904. doi:10.1021/ja5110602
    Sponsors
    We thank BASF for partial financial support, as well as EPSRC (EP/G037515/1) and EPSRC (EP/L016702/1), and EC FP7 Projects X10D (287818) and Nanomatcell (308997) for financial support. A.-C.K. acknowledges the Austrian Science Fund (FWF):[T 578-N19] for financial support.
    Publisher
    American Chemical Society (ACS)
    Journal
    Journal of the American Chemical Society
    DOI
    10.1021/ja5110602
    ae974a485f413a2113503eed53cd6c53
    10.1021/ja5110602
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; KAUST Solar Center (KSC)

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