Organic Double-Heterostructure Photovoltaic Cells Employing Thick Tris(acetylacetonato)ruthenium(III) Exciton-Blocking Layers

Authors

  • B. P. Rand,

    1. Department of Electrical Engineering and Princeton Institute for the Science and Technology of Materials (PRISM), Princeton University, Princeton, NJ 08544, USA
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  • J. Li,

    1. Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA
    2. Present address: Department of Chemical and Material Engineering and Flexible Display Center, Arizona State University, Tempe, AZ 85284, USA.
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  • J. Xue,

    1. Department of Electrical Engineering and Princeton Institute for the Science and Technology of Materials (PRISM), Princeton University, Princeton, NJ 08544, USA
    2. Global Photonic Energy Corporation, 375 Phillips Boulevard, Ewing, NJ 08618, USA
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  • R. J. Holmes,

    1. Department of Electrical Engineering and Princeton Institute for the Science and Technology of Materials (PRISM), Princeton University, Princeton, NJ 08544, USA
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  • M. E. Thompson,

    1. Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA
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  • S. R. Forrest

    1. Department of Electrical Engineering and Princeton Institute for the Science and Technology of Materials (PRISM), Princeton University, Princeton, NJ 08544, USA
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  • This work is partially supported by the National Renewable Energy Laboratory, the Air Force Office of Scientific Research, and Global Photonic Energy Corporation.

Abstract

original image

Bathocuproine (BCP) or tris(acetylacetonato)ruthenium(III) (Ru(acac)3) is used as the exciton-blocking layer (EBL) in photovoltaic cells. The difference in thickness-dependent efficiency characteristics between the blockers (see Figure) is that the Ru(acac)3 energy-level alignment allows for the transport of holes from the cathode to the C60 acceptor level, whereas BCP relies on metal-deposition-induced damage for charge transport.

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