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    Impact of Nonfullerene Acceptor Core Structure on the Photophysics and Efficiency of Polymer Solar Cells

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    PCE10_CDTBM_IDTT2BM_ACS_final.pdf
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    Description:
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    Type
    Article
    Authors
    Alamoudi, Maha A cc
    Khan, Jafar Iqbal
    Firdaus, Yuliar cc
    Wang, Kai
    Andrienko, Denis cc
    Beaujuge, Pierre cc
    Laquai, Frédéric cc
    KAUST Department
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2018-03-02
    Online Publication Date
    2018-03-02
    Print Publication Date
    2018-04-13
    Permanent link to this record
    http://hdl.handle.net/10754/627308
    
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    Abstract
    Small-molecule “nonfullerene” acceptors are promising alternatives to fullerene (PC61/71BM) derivatives often used in bulk heterojunction (BHJ) organic solar cells; yet, the efficiency-limiting processes and their dependence on the acceptor structure are not clearly understood. Here, we investigate the impact of the acceptor core structure (cyclopenta-[2,1-b:3,4-b′]dithiophene (CDT) versus indacenodithiophene (IDTT)) of malononitrile (BM)-terminated acceptors, namely CDTBM and IDTTBM, on the photophysical characteristics of BHJ solar cells. Using PCE10 as donor polymer, the IDTT-based acceptor achieves power conversion efficiencies (8.4%) that are higher than those of the CDT-based acceptor (5.6%) because of a concurrent increase in short-circuit current and open-circuit voltage. Using (ultra)fast transient spectroscopy we demonstrate that reduced geminate recombination in PCE10:IDTTBM blends is the reason for the difference in short-circuit currents. External quantum efficiency measurements indicate that the higher energy of interfacial charge-transfer states observed for the IDTT-based acceptor blends is the origin of the higher open-circuit voltage.
    Citation
    Alamoudi MA, Khan JI, Firdaus Y, Wang K, Andrienko D, et al. (2018) Impact of Nonfullerene Acceptor Core Structure on the Photophysics and Efficiency of Polymer Solar Cells. ACS Energy Letters: 802–811. Available: http://dx.doi.org/10.1021/acsenergylett.8b00045.
    Sponsors
    The research reported in this publication was supported by the Office of Sponsored Research (OSR) under the Grant Agreement FCS/1/3321/01 and by the King Abdullah University of Science and Technology (KAUST). M.A.A. is grateful to Saudi Basic Industries Corporation (SABIC) for funding received towards the Ph.D.
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS Energy Letters
    DOI
    10.1021/acsenergylett.8b00045
    Additional Links
    https://pubs.acs.org/doi/10.1021/acsenergylett.8b00045
    ae974a485f413a2113503eed53cd6c53
    10.1021/acsenergylett.8b00045
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Solar Center (KSC)

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