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

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    Name:
    Karuthedath et al_AEM 2019_accepted.pdf
    Size:
    2.580Mb
    Format:
    PDF
    Description:
    Accepted Manuscript
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    Type
    Article
    Authors
    Karuthedath, Safakath cc
    Firdaus, Yuliar cc
    Liang, Ru-Ze cc
    Gorenflot, Julien cc
    Beaujuge, Pierre cc
    Anthopoulos, Thomas D. cc
    Laquai, Frédéric cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Material Science and Engineering Program (MSE),Physical Sciences and Engineering Division (PSE), KAUST Solar Center (KSC), King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    OSR-2018-CARF/CCF-3079
    Date
    2019-07-22
    Embargo End Date
    2020-07-22
    Permanent link to this record
    http://hdl.handle.net/10754/656470
    
    Metadata
    Show full item record
    Abstract
    Ternary organic solar cells (OSCs) are among the best-performing organic photovoltaic devices to date, largely due to the recent development of nonfullerene acceptors. 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. Here, the photophysics of a prototypical ternary small-molecule OSC blend composed of the donor DR3, the nonfullerene acceptor ICC6, and the fullerene derivative PC71BM is studied by ultrafast spectroscopy. Surprisingly, it is found 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, the device's current–voltage characteristics are simulated and it is demonstrated that the parameters accurately reproduce the experimentally measured device performance.
    Citation
    Karuthedath, S., Firdaus, Y., Liang, R., Gorenflot, J., Beaujuge, P. M., Anthopoulos, T. D., & Laquai, F. (2019). Impact of Fullerene on the Photophysics of Ternary Small Molecule Organic Solar Cells. Advanced Energy Materials, 1901443. doi:10.1002/aenm.201901443
    Sponsors
    This publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No: OSR-2018-CARF/CCF-3079
    Publisher
    Wiley
    Journal
    Advanced Energy Materials
    DOI
    10.1002/aenm.201901443
    Additional Links
    https://onlinelibrary.wiley.com/doi/abs/10.1002/aenm.201901443
    ae974a485f413a2113503eed53cd6c53
    10.1002/aenm.201901443
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Solar Center (KSC)

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