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    Order enables efficient electron-hole separation at an organic heterojunction with a small energy loss

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    Type
    Article
    Authors
    Menke, S. Matthew cc
    Cheminal, Alexandre
    Conaghan, Patrick
    Ran, Niva A.
    Greehnam, Neil C.
    Bazan, Guillermo C. cc
    Nguyen, Thuc-Quyen
    Rao, Akshay cc
    Friend, Richard H. cc
    Date
    2018-01-18
    Online Publication Date
    2018-01-18
    Print Publication Date
    2018-12
    Permanent link to this record
    http://hdl.handle.net/10754/626995
    
    Metadata
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    Abstract
    Donor–acceptor organic solar cells often show low open-circuit voltages (VOC) relative to their optical energy gap (Eg) that limit power conversion efficiencies to ~12%. This energy loss is partly attributed to the offset between Eg and that of intermolecular charge transfer (CT) states at the donor–acceptor interface. Here we study charge generation occurring in PIPCP:PC61BM, a system with a very low driving energy for initial charge separation (Eg−ECT ~ 50 meV) and a high internal quantum efficiency (ηIQE ~ 80%). We track the strength of the electric field generated between the separating electron-hole pair by following the transient electroabsorption optical response, and find that while localised CT states are formed rapidly (<100 fs) after photoexcitation, free charges are not generated until 5 ps after photogeneration. In PIPCP:PC61BM, electronic disorder is low (Urbach energy <27 meV) and we consider that free charge separation is able to outcompete trap-assisted non-radiative recombination of the CT state.
    Citation
    Menke SM, Cheminal A, Conaghan P, Ran NA, Greehnam NC, et al. (2018) Order enables efficient electron-hole separation at an organic heterojunction with a small energy loss. Nature Communications 9. Available: http://dx.doi.org/10.1038/s41467-017-02457-5.
    Sponsors
    We would like to acknowledge Professor René Janssen and Professor Weiwei Li for supply of the PDPP polymers and fruitful discussion. S.M.M. and R.H.F. acknowledge support from the KAUST Competitive Research Grant Program. N.A.R., T.-Q.N. and G.C.B. acknowledge support from the Department of the Navy, Office of Naval Research (award nos. N00014-14-1-0580 and N00014-16-1-25200). A.C., P.C., N.C.G. and A.R. acknowledge support from the Engineering and Physical Sciences Research Council (EPSRC) and the Winton Programme for the Physics of Sustainability.
    Publisher
    Springer Nature
    Journal
    Nature Communications
    DOI
    10.1038/s41467-017-02457-5
    ae974a485f413a2113503eed53cd6c53
    10.1038/s41467-017-02457-5
    Scopus Count
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