C60:LiF Blocking Layer for Environmentally Stable Bulk Heterojunction Solar Cells

Authors

  • Dong Gao,

    1. Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario, Canada M5S 3E4
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  • Michael G. Helander,

    Corresponding author
    1. Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario, Canada M5S 3E4
    • Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario, Canada M5S 3E4.
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  • Zhi-Bin Wang,

    1. Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario, Canada M5S 3E4
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  • Danny P. Puzzo,

    1. Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario, Canada M5S 3E4
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  • Mark T. Greiner,

    1. Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario, Canada M5S 3E4
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  • Zheng-Hong Lu

    Corresponding author
    1. Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario, Canada M5S 3E4
    • Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario, Canada M5S 3E4.
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Abstract

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A nanocomposite of highly conductive C60 and insulating LiF (C60:LiF) is shown to function as both a highly effective passivation layer and hole blocking layer in polymer bulk heterojunction solar cells. C60:LiF composites with up to ≈80% LiF concentration dramatically increase the device stability and power conversion efficiency, enabling a new generation of high-performance and long lifetime organic photovoltaics on flexible substrates.

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