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    The role of exciton lifetime for charge generation in organic solar cells at negligible energy-level offsets

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    Type
    Article
    Authors
    Classen, Andrej cc
    Chochos, Christos L.
    Lüer, Larry cc
    Gregoriou, Vasilis G.
    Wortmann, Jonas cc
    Osvet, Andres
    Forberich, Karen
    McCulloch, Iain cc
    Heumüller, Thomas cc
    Brabec, Christoph J. cc
    KAUST Department
    Chemical Science Program
    KAUST Solar Center (KSC)
    Physical Science and Engineering (PSE) Division
    Date
    2020-08-31
    Online Publication Date
    2020-08-31
    Print Publication Date
    2020-09
    Embargo End Date
    2021-03-03
    Submitted Date
    2019-10-18
    Permanent link to this record
    http://hdl.handle.net/10754/664985
    
    Metadata
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    Abstract
    Organic solar cells utilize an energy-level offset to generate free charge carriers. Although a very small energy-level offset increases the open-circuit voltage, it remains unclear how exactly charge generation is affected. Here we investigate organic solar cell blends with highest occupied molecular orbital energy-level offsets (∆EHOMO) between the donor and acceptor that range from 0 to 300 meV. We demonstrate that exciton quenching at a negligible ∆EHOMO takes place on timescales that approach the exciton lifetime of the pristine materials, which drastically limits the external quantum efficiency. We quantitatively describe this finding via the Boltzmann stationary-state equilibrium between charge-transfer states and excitons and further reveal a long exciton lifetime to be decisive in maintaining an efficient charge generation at a negligible ∆EHOMO. Moreover, the Boltzmann equilibrium quantitatively describes the major reduction in non-radiative voltage losses at a very small ∆EHOMO. Ultimately, highly luminescent near-infrared emitters with very long exciton lifetimes are suggested to enable highly efficient organic solar cells.
    Citation
    Classen, A., Chochos, C. L., Lüer, L., Gregoriou, V. G., Wortmann, J., Osvet, A., … Brabec, C. J. (2020). The role of exciton lifetime for charge generation in organic solar cells at negligible energy-level offsets. Nature Energy. doi:10.1038/s41560-020-00684-7
    Sponsors
    A.C. and C.J.B. gratefully acknowledge funding from the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation), Project no. 182849149-SFB 953. C.J.B. gratefully acknowledges financial support through the ‘Aufbruch Bayern’ initiative of the state of Bavaria (EnCN and SFF) and the Bavarian Initiative ‘Solar Technologies go Hybrid’ (SolTech) and funding from DFG project DFG INST 90/917. C.C.L. thanks the European Union for the financial support. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreements no. 761112 (PRESTIGE) and no. 820789 (OLEDSOLAR).
    Publisher
    Springer Science and Business Media LLC
    Journal
    Nature Energy
    DOI
    10.1038/s41560-020-00684-7
    Additional Links
    http://www.nature.com/articles/s41560-020-00684-7
    ae974a485f413a2113503eed53cd6c53
    10.1038/s41560-020-00684-7
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; KAUST Solar Center (KSC)

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