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    Burn-in Free Nonfullerene-Based Organic Solar Cells

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    Gasparini et al. Main text and SI_REVISION.pdf
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    Type
    Article
    Authors
    Gasparini, Nicola cc
    Salvador, Michael
    Strohm, Sebastian
    Heumueller, Thomas
    Levchuk, Ievgen
    Wadsworth, Andrew cc
    Bannock, James H.
    de Mello, John C.
    Egelhaaf, Hans-Joachim
    Baran, Derya cc
    McCulloch, Iain cc
    Brabec, Christoph J. cc
    KAUST Department
    Chemical Science Program
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2017-07-03
    Online Publication Date
    2017-07-03
    Print Publication Date
    2017-10
    Permanent link to this record
    http://hdl.handle.net/10754/627078
    
    Metadata
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    Abstract
    Organic solar cells that are free of burn-in, the commonly observed rapid performance loss under light, are presented. The solar cells are based on poly(3-hexylthiophene) (P3HT) with varying molecular weights and a nonfullerene acceptor (rhodanine-benzothiadiazole-coupled indacenodithiophene, IDTBR) and are fabricated in air. P3HT:IDTBR solar cells light-soaked over the course of 2000 h lose about 5% of power conversion efficiency (PCE), in stark contrast to [6,6]-Phenyl C61 butyric acid methyl ester (PCBM)-based solar cells whose PCE shows a burn-in that extends over several hundreds of hours and levels off at a loss of ≈34%. Replacing PCBM with IDTBR prevents short-circuit current losses due to fullerene dimerization and inhibits disorder-induced open-circuit voltage losses, indicating a very robust device operation that is insensitive to defect states. Small losses in fill factor over time are proposed to originate from polymer or interface defects. Finally, the combination of enhanced efficiency and stability in P3HT:IDTBR increases the lifetime energy yield by more than a factor of 10 when compared with the same type of devices using a fullerene-based acceptor instead.
    Citation
    Gasparini N, Salvador M, Strohm S, Heumueller T, Levchuk I, et al. (2017) Burn-in Free Nonfullerene-Based Organic Solar Cells. Advanced Energy Materials 7: 1700770. Available: http://dx.doi.org/10.1002/aenm.201700770.
    Sponsors
    N.G. and M.S. contributed equally to this work. The authors gratefully acknowledge the support of the Cluster of Excellence “Engineering of Advanced Materials” at the University of Erlangen–Nuremberg, which is funded by the German Research Foundation (DFG) within the framework of its “Excellence Initiative,” Synthetic Carbon Allotropes (SFB953) and Solar Technologies go Hybrid (SolTech). M.S. acknowledges primary support from a fellowship by the Portuguese Fundação para a Ciência e a Tecnologia (SFRH/BPD/71816/2010). The authors wish to thank Dr. Siva Krishnadasan (Department of Chemistry, Imperial College, London) for assistance in the preparation of P3HT and Dr. Florian Machui (ZAE Bayern) for fruitful discussions for device preparation.
    Publisher
    Wiley
    Journal
    Advanced Energy Materials
    DOI
    10.1002/aenm.201700770
    Additional Links
    http://onlinelibrary.wiley.com/doi/10.1002/aenm.201700770/full
    ae974a485f413a2113503eed53cd6c53
    10.1002/aenm.201700770
    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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