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    Intrinsic efficiency limits in low-bandgap non-fullerene acceptor organic solar cells

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    Type
    Article
    Authors
    Karuthedath, Safakath cc
    Gorenflot, Julien cc
    Firdaus, Yuliar cc
    Chaturvedi, Neha cc
    De Castro, Catherine S. P. cc
    Harrison, George T.
    Khan, Jafar Iqbal
    Markina, Anastasia
    Albalawi, Ahmed
    Peña, Top Archie Dela cc
    Liu, Wenlan
    Liang, Ru-Ze cc
    Sharma, Anirudh cc
    Paleti, Sri Harish Kumar cc
    Zhang, Weimin
    Lin, Yuanbao
    Alarousu, Erkki
    Anjum, Dalaver H. cc
    Beaujuge, Pierre
    De Wolf, Stefaan cc
    McCulloch, Iain cc
    Anthopoulos, Thomas D. cc
    Baran, Derya
    Andrienko, Denis cc
    Laquai, Frédéric cc
    KAUST Department
    Physical Science and Engineering (PSE) Division
    KAUST Solar Center (KSC)
    KAUST Solar Center, Physical Sciences and Engineering Division (PSE), Materials Science and Engineering Program (MSE), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia.
    Ali I. Al-Naimi Petroleum Engineering Research Center (ANPERC)
    Material Science and Engineering Program
    Material Science and Engineering
    Imaging and Characterization Core Lab
    Electron Microscopy
    Biological and Environmental Sciences and Engineering (BESE) Division
    Chemical Science Program
    KAUST Grant Number
    CRG
    OSR-2018-CARF/CCF-3079
    Date
    2020-10-23
    Online Publication Date
    2020-10-23
    Print Publication Date
    2021-03
    Embargo End Date
    2021-04-26
    Submitted Date
    2019-09-21
    Permanent link to this record
    http://hdl.handle.net/10754/665682
    
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    Abstract
    In bulk heterojunction (BHJ) organic solar cells (OSCs) both the electron affinity (EA) and ionization energy (IE) offsets at the donor–acceptor interface should equally control exciton dissociation. Here, we demonstrate that in low-bandgap non-fullerene acceptor (NFA) BHJs ultrafast donor-to-acceptor energy transfer precedes hole transfer from the acceptor to the donor and thus renders the EA offset virtually unimportant. Moreover, sizeable bulk IE offsets of about 0.5 eV are needed for efficient charge transfer and high internal quantum efficiencies, since energy level bending at the donor–NFA interface caused by the acceptors’ quadrupole moments prevents efficient exciton-to-charge-transfer state conversion at low IE offsets. The same bending, however, is the origin of the barrier-less charge transfer state to free charge conversion. Our results provide a comprehensive picture of the photophysics of NFA-based blends, and show that sizeable bulk IE offsets are essential to design efficient BHJ OSCs based on low-bandgap NFAs.
    Citation
    Karuthedath, S., Gorenflot, J., Firdaus, Y., Chaturvedi, N., De Castro, C. S. P., Harrison, G. T., … Laquai, F. (2020). Intrinsic efficiency limits in low-bandgap non-fullerene acceptor organic solar cells. Nature Materials. doi:10.1038/s41563-020-00835-x
    Sponsors
    This publication is based on work supported by the KAUST Office of Sponsored Research (OSR) under award nos. OSR-2018-CARF/CCF-3079 and OSR-CRG2018-3746. D.A. acknowledges funding from the BMBF grant InterPhase and MESOMERIE (grant nos. FKZ 13N13661, FKZ 13N13656) and the European Union Horizon 2020 research and innovation program ‘Widening materials models’ under grant agreement no. 646259 (MOSTOPHOS). D.A. also acknowledges the KAUST PSE Division for hosting his sabbatical in the framework of the Division’s Visiting Faculty program. A.M. acknowledges funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement no. 844655 (SMOLAC). We thank L. Sinatra of KAUST and Quantum Solutions LLC for assisting with the PLQY measurements. G.T.H acknowledges K. Graham and A. Amassian (and previous group members including M. Tietze and G.O.N. Ndjawa) for having designed and installed and worked on the IPES setup. In particular, G.T.H. acknowledges K. Graham’s kind assistance during the reconfiguration and optimization of the IPES setup, as well as U. Sharif for technical assistance.
    Publisher
    Springer Nature
    Journal
    Nature Materials
    DOI
    10.1038/s41563-020-00835-x
    10.1038/s41563-021-01178-x
    Additional Links
    http://www.nature.com/articles/s41563-020-00835-x
    ae974a485f413a2113503eed53cd6c53
    10.1038/s41563-020-00835-x
    Scopus Count
    Collections
    Articles; Ali I. Al-Naimi Petroleum Engineering Research Center (ANPERC); Biological and Environmental Science and Engineering (BESE) Division; Imaging and Characterization Core Lab; Physical Science and Engineering (PSE) Division; Chemical Science Program; Material Science and Engineering Program; KAUST Solar Center (KSC)

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