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    Impact of Fullerene on the Photophysics of Ternary Small Molecule Organic Solar Cells

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    Type
    Presentations
    Authors
    Karuthedath, Safakath cc
    Firdaus, Yuliar cc
    Liang, Ru-Ze cc
    Gorenflot, Julien cc
    M. Beaujuge, Pierre
    D. Anthopoulos, Thomas
    Laquai, Frédéric cc
    KAUST Department
    King Abdullah University of Science and Technology (KAUST) - Saudi Arabia
    Physical Science and Engineering (PSE) Division
    Material Science and Engineering Program
    KAUST Solar Center (KSC)
    Date
    2019-07-18
    Permanent link to this record
    http://hdl.handle.net/10754/676746
    
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    Abstract
    Ternary organic solar cells (OSC) are among the best-performing organic photovoltaic devices to date, largely due to the recent development of non-fullerene acceptors.[1] However, fullerene molecules still play an important role in ternary OSC systems, since, for reasons not well understood, they often improve the device performance, despite their lack of absorption.[2] In this work, we study the photophysics of a prototypical ternary small molecule OSC blend composed of the donor DR3, the non-fullerene acceptor ICC6, and the fullerene derivative PC71BM by ultrafast spectroscopy. Surprisingly, we find that after excitation of PC71BM, ultrafast singlet energy transfer to ICC6 competes efficiently with charge transfer. Subsequently, singlets on ICC6 undergo hole transfer to DR3, resulting in free charge generation. Interestingly, PC71BM improves indirectly the electron mobility of the ternary blend, while electrons reside predominantly in ICC6 domains as indicated by fast spectroscopy. The improved mobility facilitates charge carrier extraction, in turn leading to higher device efficiencies of the ternary compared to binary solar cells. Using the (photo)physical parameters obtained from (transient) spectroscopy and charge transport measurements, we simulate the device’s current-voltage characteristics and demonstrate that the parameters accurately reproduce the experimentally-measured device performance
    Citation
    KARUTHEDATH, S., Firdaus, Y., Liang, R.-Z., Gorenflot, J., M. Beaujuge, P., D. Anthopoulos, T., & Laquai, F. (2019). Impact of Fullerene on the Photophysics of Ternary Small Molecule Organic Solar Cells. Proceedings of the nanoGe Fall Meeting19. doi:10.29363/nanoge.nfm.2019.108
    Sponsors
    Supported by funding from King Abdullah University of Science and Technology (KAUST).
    Publisher
    Fundació Scito
    Conference/Event name
    Proceedings of nanoGe Fall Meeting19 (NFM19) #OPV19. Organic Photovoltaics: recent breakthroughs, advanced characterization and modelling
    DOI
    10.29363/nanoge.nfm.2019.108
    Additional Links
    https://www.nanoge.org/proceedings/NFM19/5d0f8486c4eeba5c9e2d0768
    ae974a485f413a2113503eed53cd6c53
    10.29363/nanoge.nfm.2019.108
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