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    Polymer Main-Chain Substitution Effects on the Efficiency of Nonfullerene BHJ Solar Cells

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    Type
    Article
    Authors
    Firdaus, Yuliar cc
    Maffei, Luna Pratali
    Cruciani, Federico cc
    Müller, Michael A.
    Liu, Shengjian
    Lopatin, Sergei cc
    Wehbe, Nimer
    Ngongang Ndjawa, Guy Olivier cc
    Amassian, Aram cc
    Laquai, Frédéric cc
    Beaujuge, Pierre cc
    KAUST Department
    Chemical Science Program
    Electron Microscopy
    Imaging and Characterization Core Lab
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Organic Electronics and Photovoltaics Group
    Physical Science and Engineering (PSE) Division
    Surface Science
    Date
    2017-07-21
    Online Publication Date
    2017-07-21
    Print Publication Date
    2017-11
    Permanent link to this record
    http://hdl.handle.net/10754/625699
    
    Metadata
    Show full item record
    Abstract
    “Nonfullerene” acceptors are proving effective in bulk heterojunction (BHJ) solar cells when paired with selected polymer donors. However, the principles that guide the selection of adequate polymer donors for high-efficiency BHJ solar cells with nonfullerene acceptors remain a matter of some debate and, while polymer main-chain substitutions may have a direct influence on the donor–acceptor interplay, those effects should be examined and correlated with BHJ device performance patterns. This report examines a set of wide-bandgap polymer donor analogues composed of benzo[1,2-b:4,5-b′]dithiophene (BDT), and thienyl ([2H]T) or 3,4-difluorothiophene ([2F]T) motifs, and their BHJ device performance pattern with the nonfullerene acceptor “ITIC”. Studies show that the fluorine- and ring-substituted derivative PBDT(T)[2F]T largely outperforms its other two polymer donor counterparts, reaching power conversion efficiencies as high as 9.8%. Combining several characterization techniques, the gradual device performance improvements observed on swapping PBDT[2H]T for PBDT[2F]T, and then for PBDT(T)[2F]T, are found to result from (i) notably improved charge generation and collection efficiencies (estimated as ≈60%, 80%, and 90%, respectively), and (ii) reduced geminate recombination (being suppressed from ≈30%, 25% to 10%) and bimolecular recombination (inferred from recombination rate constant comparisons). These examinations will have broader implications for further studies on the optimization of BHJ solar cell efficiencies with polymer donors and a wider range of nonfullerene acceptors.
    Citation
    Firdaus Y, Maffei LP, Cruciani F, Müller MA, Liu S, et al. (2017) Polymer Main-Chain Substitution Effects on the Efficiency of Nonfullerene BHJ Solar Cells. Advanced Energy Materials 7: 1700834. Available: http://dx.doi.org/10.1002/aenm.201700834.
    Sponsors
    Y.F. and L.P.M. contributed equally to this work. 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. CRG_R2_13_BEAU_KAUST_1. The authors acknowledge concurrent support under Baseline Research Funding from KAUST. The authors thank KAUST ACL for technical support in the mass spectrometry, GPC, and elemental analyses. The authors thank Z. Kan and M. Babics for the discussions in device characterizations.
    Publisher
    Wiley
    Journal
    Advanced Energy Materials
    DOI
    10.1002/aenm.201700834
    Additional Links
    http://onlinelibrary.wiley.com/doi/10.1002/aenm.201700834/full
    ae974a485f413a2113503eed53cd6c53
    10.1002/aenm.201700834
    Scopus Count
    Collections
    Articles; 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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