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Self-Organized Buffer Layers in Organic Solar Cells

Authors

  • Qingshuo Wei,

    1. Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan)
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  • Takeshi Nishizawa,

    1. Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan)
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  • Keisuke Tajima,

    Corresponding author
    1. Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan)
    • Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan).
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  • Kazuhito Hashimoto

    Corresponding author
    1. Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan)
    2. HASHIMOTO Light Energy Conversion Project, Exploratory Research for Advanced Technology (ERATO), Japan Science Technology Agency (JST), Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan)
    • Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan).
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  • We thank Prof. Seki (Nagoya University) and Dr. Yoshida (The University of Tokyo) for helpful discussions, Dr. Mori and Mr. Miyazaki (Sumitomo Heavy Industries) for photoelectron yield spectroscopy measurements, Dr. Nakano for 19F NMR measurements, and Mr. Miyanishi for the polymer synthesis. Supporting Information is available online from Wiley InterScience or from the authors.

Abstract

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A fullerene derivative with a fluorocarbon chain is applied in bulk-heterojunction polymer solar cells (see figure). When a small amount of F-PCBM is mixed in, it spontaneously migrates to the surface of the organic layer during spin-casting owing to the low surface energy of the fluorocarbon. A very thin buffer layer between the polymer and the metal electrode is formed in one step, resulting in improved photovoltaic performance.

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