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    Thienyl Sidechain Substitution and Backbone Fluorination of Benzodithiophene-based Donor Polymers Concertedly Minimize Carrier Losses in ITIC-based Organic Solar Cells

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    TT_Thienyl.pdf
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    Type
    Article
    Authors
    Khan, Jafar Iqbal
    Firdaus, Yuliar cc
    Cruciani, Federico cc
    Liu, Shengjian
    Anthopoulos, Thomas D. cc
    Beaujuge, Pierre
    Laquai, Frédéric cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Chemical Science Program
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    OSR-2018-CARF/CCF-3079
    Date
    2020-04-22
    Online Publication Date
    2020-04-22
    Print Publication Date
    2020-05-14
    Embargo End Date
    2021-04-22
    Permanent link to this record
    http://hdl.handle.net/10754/662653
    
    Metadata
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    Abstract
    Non-fullerene acceptor (NFA) based organic solar cells have outperformed fullerene-based devices, yet their photophysics is less well understood. Herein, changes in the donor polymer backbone side-chain substitution and backbone fluorination in benzodithiophene (BDT)-thiophene copolymers are linked to the photophysical processes and performance of bulk heterojunction (BHJ) solar cells, using ITIC as NFA. Increased geminate recombination is observed when the donor polymer is alkoxy-substituted in conjunction with faster non-geminate recombination of free charges, limiting both the short circuit current and device fill factor. In contrast, thienylsubstitution reduces geminate recombination, albeit non-geminate recombination remains significant, leading to improved short circuit current density, yet not fill factor. Only the combination of thienyl-substitution and polymer backbone fluorination yields both efficient charge separation and significantly reduced non-geminate recombination, resulting in fill factors (FFs) in excess of 60 %. Time-delayed collection field measurements ascertain that charge generation is field-independent in the thienyl-substituted donor polymer:ITIC systems, while weakly field dependent in the alkoxy-substitued polymer:ITIC blend, indicating the low FFs are primarily caused by non-geminate recombination. This work provides insight into the interplay of donor polymer structure, BHJ photophysics, and device performance for a prototypical NFA, namely ITIC. More specifically, it links the donor polymer chemical structure to quantifiable changes of kinetic parameters and the yield of individual processes in ITIC-based BHJ blends.
    Citation
    Khan, J. I., Firdaus, Y., Cruciani, F., Liu, S., Anthopoulos, T. D., Beaujuge, P. M., & Laquai, F. (2020). Thienyl Sidechain Substitution and Backbone Fluorination of Benzodithiophene-based Donor Polymers Concertedly Minimize Carrier Losses in ITIC-based Organic Solar Cells. The Journal of Physical Chemistry C. doi:10.1021/acs.jpcc.0c03282
    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
    American Chemical Society (ACS)
    Journal
    The Journal of Physical Chemistry C
    DOI
    10.1021/acs.jpcc.0c03282
    Additional Links
    https://pubs.acs.org/doi/abs/10.1021/acs.jpcc.0c03282
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.jpcc.0c03282
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Physical Science and Engineering (PSE) Division; Chemical Science Program; Material Science and Engineering Program; KAUST Solar Center (KSC)

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