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Organic Sensitizers with Bridged Triphenylamine Donor Units for Efficient Dye-Sensitized Solar Cells

Authors

  • Liping Cai,

    1. Department of Chemical and Biomolecular Engineering, National University of Singapore, 117576, Singapore
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  • Hoi Nok Tsao,

    1. École Polytechnique Fédérale de Lausanne, Institute of Chemical Sciences and Engineering, Laboratory of Photonics and Interfaces, 1015 Lausanne, Switzerland
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  • Wei Zhang,

    1. Department of Chemical and Biomolecular Engineering, National University of Singapore, 117576, Singapore
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  • Long Wang,

    1. Department of Chemical and Biomolecular Engineering, National University of Singapore, 117576, Singapore
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  • Zhaosheng Xue,

    1. Department of Chemical and Biomolecular Engineering, National University of Singapore, 117576, Singapore
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  • Michael Grätzel,

    Corresponding author
    1. École Polytechnique Fédérale de Lausanne, Institute of Chemical Sciences and Engineering, Laboratory of Photonics and Interfaces, 1015 Lausanne, Switzerland
    • École Polytechnique Fédérale de Lausanne, Institute of Chemical Sciences and Engineering, Laboratory of Photonics and Interfaces, 1015 Lausanne, Switzerland
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  • Bin Liu

    Corresponding author
    1. Department of Chemical and Biomolecular Engineering, National University of Singapore, 117576, Singapore
    2. Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602
    • Department of Chemical and Biomolecular Engineering, National University of Singapore, 117576, Singapore.
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Abstract

Bridged triphenylamine was chosen as the donor unit for metal-free organic sensitizers in dye-sensitized solar cells (DSSCs). The easily constructed alkene linkage between the donor and the spacer improves the molecule's delocalization and causes a large red shift in its absorption peaks. Planarization of the donor and the use of alkene linkage have proven powerful in extending the red light response of the sensitizer, leading to a significant enhancement in photocurrent density of the device. As a result, devices sensitized with target sensitizers LC-2 (η = 7.51%) and LC-3 (η = 8.00%) exhibited more than 70% efficiency increase over devices sensitized with the reference sensitizer LC-1 (η = 4.44%).

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