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    Excitation Wavelength Dependent Internal Quantum Efficiencies in a P3HT / Non-Fullerene Acceptor Solar Cell

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    acs.jpcc.8b10918.pdf
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    Type
    Article
    Authors
    Tan, Ching-Hong
    Wadsworth, Andrew
    Gasparini, Nicola
    Wheeler, Scot
    Holliday, Sarah
    Ashraf, Raja Shahid
    Dimitrov, Stoichko D.
    Baran, Derya cc
    McCulloch, Iain cc
    Durrant, James R.
    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-CRG-2572
    Date
    2018-12-24
    Permanent link to this record
    http://hdl.handle.net/10754/630366
    
    Metadata
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    Abstract
    Solar cells based on blends of the donor polymer, P3HT, with the non-fullerene acceptor, IDTBR, have been shown to exhibit promising efficiencies and stabilities for low cost organic photovoltaic (OPV) devices. We focus herein on the charge separation and recombination dynamics in such devices. By employing selective wavelength excitations of P3HT and O-IDTBR, we show that photoexcitation of the P3HT results in lower internal quantum efficiency (IQE) for photocurrent generation than observed for photoexcitation of the O-IDTBR. Transient absorption and photoluminescence quenching studies indicate that this lower IQE results primarily from higher geminate recombination losses of photogenerated charges following P3HT excitation compared with O-IDTBR excitation, rather than from differences in exciton separation efficiency. These higher geminate recombination losses result not only in a lower photocurrent generation efficiency at short circuit, but also a lower device J-V fill factor upon selective excitation of the P3HT donor, when compared with O-IDTBR excitation.
    Citation
    Tan C-H, Wadsworth A, Gasparini N, Wheeler S, Holliday S, et al. (2018) Excitation Wavelength Dependent Internal Quantum Efficiencies in a P3HT / Non-Fullerene Acceptor Solar Cell. The Journal of Physical Chemistry C. Available: http://dx.doi.org/10.1021/acs.jpcc.8b10918.
    Sponsors
    The authors declare no competing financial interests. The author CH Tan thanks Malaysian Government MyBrainSc for the funding and also Matthew Davies from Swansea University for providing PL excitation spectroscopy instrument. Funding from the KAUST project OSR-2015-CRG-2572 is gratefully acknowledged. The authors also thank KAUST for financial support and acknowledge EC FP7 Project SC2 (610115), EC H2020 (643791), and EPSRC Projects EP/G037515/1 and EP/M005143/1.
    Publisher
    American Chemical Society (ACS)
    Journal
    The Journal of Physical Chemistry C
    DOI
    10.1021/acs.jpcc.8b10918
    Additional Links
    https://pubs.acs.org/doi/10.1021/acs.jpcc.8b10918
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.jpcc.8b10918
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; Material Science and Engineering Program; KAUST Solar Center (KSC)

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