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    An Efficient, “Burn in” Free Organic Solar Cell Employing a Nonfullerene Electron Acceptor

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    Type
    Article
    Authors
    Cha, Hyojung
    Wu, Jiaying
    Wadsworth, Andrew cc
    Nagitta, Jade
    Limbu, Saurav
    Pont, Sebastian
    Li, Zhe
    Searle, Justin
    Wyatt, Mark F.
    Baran, Derya cc
    Kim, Ji-Seon
    McCulloch, Iain cc
    Durrant, James R. cc
    KAUST Department
    Chemical Science Program
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    OSR-2015-CRG4-2572
    Date
    2017-06-28
    Online Publication Date
    2017-06-28
    Print Publication Date
    2017-09
    Permanent link to this record
    http://hdl.handle.net/10754/625643
    
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    Show full item record
    Abstract
    A comparison of the efficiency, stability, and photophysics of organic solar cells employing poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-(3,3'″-di(2-octyldodecyl)-2,2';5',2″;5″,2'″-quaterthiophen-5,5'″-diyl)] (PffBT4T-2OD) as a donor polymer blended with either the nonfullerene acceptor EH-IDTBR or the fullerene derivative, [6,6]-phenyl C71 butyric acid methyl ester (PC71 BM) as electron acceptors is reported. Inverted PffBT4T-2OD:EH-IDTBR blend solar cell fabricated without any processing additive achieves power conversion efficiencies (PCEs) of 9.5 ± 0.2%. The devices exhibit a high open circuit voltage of 1.08 ± 0.01 V, attributed to the high lowest unoccupied molecular orbital (LUMO) level of EH-IDTBR. Photoluminescence quenching and transient absorption data are employed to elucidate the ultrafast kinetics and efficiencies of charge separation in both blends, with PffBT4T-2OD exciton diffusion kinetics within polymer domains, and geminate recombination losses following exciton separation being identified as key factors determining the efficiency of photocurrent generation. Remarkably, while encapsulated PffBT4T-2OD:PC71 BM solar cells show significant efficiency loss under simulated solar irradiation (“burn in” degradation) due to the trap-assisted recombination through increased photoinduced trap states, PffBT4T-2OD:EH-IDTBR solar cell shows negligible burn in efficiency loss. Furthermore, PffBT4T-2OD:EH-IDTBR solar cells are found to be substantially more stable under 85 °C thermal stress than PffBT4T-2OD:PC71BM devices.
    Citation
    Cha H, Wu J, Wadsworth A, Nagitta J, Limbu S, et al. (2017) An Efficient, “Burn in” Free Organic Solar Cell Employing a Nonfullerene Electron Acceptor. Advanced Materials 29: 1701156. Available: http://dx.doi.org/10.1002/adma.201701156.
    Sponsors
    The authors gratefully acknowledge funding supported by KAUST under the Grant Agreement number OSR-2015-CRG4-2572, the EU FP7 project CHEETAH, the EPSRC through the Centre for Doctoral Training in Plastic Electronics (EP/L0160702/1) and thank Pabitra Shakya for assistance in device fabrication.
    Publisher
    Wiley
    Journal
    Advanced Materials
    DOI
    10.1002/adma.201701156
    PubMed ID
    28657152
    Additional Links
    http://onlinelibrary.wiley.com/doi/10.1002/adma.201701156/full
    ae974a485f413a2113503eed53cd6c53
    10.1002/adma.201701156
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; Material Science and Engineering Program; Material Science and Engineering Program; KAUST Solar Center (KSC)

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