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Stable Inverted Polymer/Fullerene Solar Cells Using a Cationic Polythiophene Modified PEDOT:PSS Cathodic Interface

Authors

  • David A. Rider,

    Corresponding author
    1. Department of Chemistry University of Alberta 11227 Saskatchewan Drive Edmonton, Alberta T6G 2G2 (Canada)
    2. NRC National Institute for Nanotechnology Edmonton, Alberta T6G 2M9 (Canada)
    • Department of Chemistry University of Alberta 11227 Saskatchewan Drive Edmonton, Alberta T6G 2G2 (Canada).
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  • Brian J. Worfolk,

    1. Department of Chemistry University of Alberta 11227 Saskatchewan Drive Edmonton, Alberta T6G 2G2 (Canada)
    2. NRC National Institute for Nanotechnology Edmonton, Alberta T6G 2M9 (Canada)
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  • Kenneth D. Harris,

    1. NRC National Institute for Nanotechnology Edmonton, Alberta T6G 2M9 (Canada)
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  • Abeed Lalany,

    1. Department of Electrical and Computer Engineering University of Alberta Edmonton, Alberta T6G 2V4 (Canada)
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  • Kevin Shahbazi,

    1. NRC National Institute for Nanotechnology Edmonton, Alberta T6G 2M9 (Canada)
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  • Michael D. Fleischauer,

    1. NRC National Institute for Nanotechnology Edmonton, Alberta T6G 2M9 (Canada)
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  • Michael J. Brett,

    1. NRC National Institute for Nanotechnology Edmonton, Alberta T6G 2M9 (Canada)
    2. Department of Electrical and Computer Engineering University of Alberta Edmonton, Alberta T6G 2V4 (Canada)
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  • Jillian M. Buriak

    1. Department of Chemistry University of Alberta 11227 Saskatchewan Drive Edmonton, Alberta T6G 2G2 (Canada)
    2. NRC National Institute for Nanotechnology Edmonton, Alberta T6G 2M9 (Canada)
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Abstract

A cationic and water-soluble polythiophene [poly[3-(6-pyridiniumylhexyl)thiophene bromide] (P3PHT+Br)] is synthesized and used in combination with anionic poly(3,4-ethylenedioxythiophene):poly(p-styrenesulfonate) (PEDOT:PSS) to produce hybrid coatings on indium tin oxide (ITO). Two coating strategies are established: i) electrostatic layer-by-layer assembly with colloidal suspensions of (PEDOT:PSS), and ii) modification of an electrochemically prepared (PEDOT:PSS) film on ITO. The coatings are found to modify the work function of ITO such that it could act as a cathode in inverted 2,5-diyl-poly(3-hexylthiophene) (P3HT)/[6,6]-phenyl-C61-butyric acid methyl ester (PCBM) polymer photovoltaic cells. The interfacial modifier created from the layer-by-layer assembly route is used to produce efficient inverted organic photovoltaic devices (power conversion efficiency ∼2%) with significant long-term stability in excess of 500 h.

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