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Enhanced Open-Circuit Voltage in High Performance Polymer/Fullerene Bulk-Heterojunction Solar Cells by Cathode Modification with a C60 Surfactant

Authors

  • Kevin M. O'Malley,

    1. Department of Chemistry, University of Washington, Box 351700, Seattle, WA 98195, USA
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  • Chang-Zhi Li,

    1. Department of Materials Science and Engineering, University of Washington, Box 352120, Seattle, WA 98195, USA
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  • Hin-Lap Yip,

    1. Department of Materials Science and Engineering, University of Washington, Box 352120, Seattle, WA 98195, USA
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  • Alex K.-Y. Jen

    Corresponding author
    1. Department of Chemistry, University of Washington, Box 351700, Seattle, WA 98195, USA
    2. Department of Materials Science and Engineering, University of Washington, Box 352120, Seattle, WA 98195, USA
    • Department of Chemistry, University of Washington, Box 351700, Seattle, WA 98195, USA.
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Abstract

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A bis-adduct C60 surfactant is used to modify the energy-level alignment at the interface between the photoactive layer and cathode contact of a conventional bulk-heterojunction solar cell comprised of a low-bandgap polymer and PC71BM. The metal Fermi level pins to that of the surfactant, dramatically increasing the device's open-circuit voltage regardless of the cathode metal identity, leading to significantly enhanced power-conversion efficiency (up to 6.22%) and device stability.

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