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    P3HT Molecular Weight Determines the Performance of P3HT:O-IDTBR Solar Cells

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    Type
    Article
    Authors
    Khan, Jafar Iqbal
    Ashraf, Raja
    Alamoudi, Maha A cc
    Nabi, Mohammed N.
    Mohammed, Hamza N.
    Wadsworth, Andrew
    Firdaus, Yuliar cc
    Zhang, Weimin
    Anthopoulos, Thomas D. cc
    McCulloch, Iain cc
    Laquai, Frédéric cc
    KAUST Department
    Chemical Science Program
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    The KAUST School
    KAUST Grant Number
    FCS/1/3321/01
    Date
    2019-05-17
    Permanent link to this record
    http://hdl.handle.net/10754/652875
    
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    Abstract
    Large-scale production of organic solar modules requires low-cost and reliable materials with reproducible batch-to-batch properties. In case of polymers, their (photo)physical properties depend strongly on the polymers’ molecular weight. Here, we study the impact of the molecular weight of the donor polymer poly(3-hexylthiophene) (P3HT) on the photophysics in blends with a recently-developed rhodanine-endcapped indacenodithiophene non-fullerene acceptor (IDTBR), a bulk heterojunction system that can potentially fulfill the aforementioned criteria for large-scale production. We find that the power conversion efficiency (PCE) increases when the weight-average molecular weight (MW) is increased from 17kDa (PCE: 4.0%) to 34 kDa (PCE: 6.6%), while a further increase in MW leads to a reduced PCE of 4.4%. We demonstrate that the charge generation efficiency, as estimated from time-delayed collection field (TDCF) experiments, varies with the P3HT molecular weight and is the reason for the differences in photocurrent and device performance. Our findings provide insight into the fundamental photophysical reasons of the molecular weight dependence of the power conversion efficiency, which has to be taken into account when using polymer-based non-fullerene acceptor blends in solar cell devices and modules.
    Citation
    Khan JI, Ashraf RS, Alamoudi MA, Nabi MN, Mohammed HN, et al. (2019) P3HT Molecular Weight Determines the Performance of P3HT:O-IDTBR Solar Cells. Solar RRL. Available: http://dx.doi.org/10.1002/solr.201900023.
    Sponsors
    The research reported in this publication was supported by the Office of Sponsored Research (OSR) under the Grant Agreement FCS/1/3321/01 and by baseline funding from the King Abdullah University of Science and Technology (KAUST). M. A. A. is grateful to Saudi Basic Industries Corporation (SABIC) for funding received towards the PhD. H.N.M. thanks the KAUST SRSI program for support.J.I.K. and R.S.A. contributed equally to the work.
    Publisher
    Wiley
    Journal
    Solar RRL
    DOI
    10.1002/solr.201900023
    Additional Links
    https://onlinelibrary.wiley.com/doi/abs/10.1002/solr.201900023
    ae974a485f413a2113503eed53cd6c53
    10.1002/solr.201900023
    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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