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Enhanced-Light-Harvesting Amphiphilic Ruthenium Dye for Efficient Solid-State Dye-Sensitized Solar Cells

Authors

  • Mingkui Wang,

    1. Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology CH 1015 Lausanne (Switzerland)
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  • Soo-Jin Moon,

    1. Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology CH 1015 Lausanne (Switzerland)
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  • Difei Zhou,

    1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences Changchun 130022 (PR China)
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  • Florian Le Formal,

    1. Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology CH 1015 Lausanne (Switzerland)
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  • Ngoc-Lê Cevey-Ha,

    1. Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology CH 1015 Lausanne (Switzerland)
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  • Robin Humphry-Baker,

    1. Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology CH 1015 Lausanne (Switzerland)
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  • Carole Grätzel,

    1. Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology CH 1015 Lausanne (Switzerland)
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  • Peng Wang,

    Corresponding author
    1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences Changchun 130022 (PR China)
    • State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences Changchun 130022 (PR China)
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  • Shaik M. Zakeeruddin,

    Corresponding author
    1. Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology CH 1015 Lausanne (Switzerland)
    • Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology CH 1015 Lausanne (Switzerland)
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  • Michael Grätzel

    Corresponding author
    1. Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology CH 1015 Lausanne (Switzerland)
    • Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology CH 1015 Lausanne (Switzerland)
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Abstract

A ruthenium sensitizer (coded C101, NaRu (4,4′-bis(5-hexylthiophen-2-yl)-2,2′-bipyridine) (4-carboxylic acid-4′-caboxylate-2,2′-bipyridine) (NCS)2) containing a hexylthiophene-conjugated bipyridyl group as an ancillary ligand is presented for use in solid-state dye-sensitized solar cells (SSDSCs). The high molar-extinction coefficient of this dye is advantageous compared to the widely used Z907 dye, (NaRu (4-carboxylic acid-4′-carboxylate) (4,4′-dinonyl-2,2′-bipyridine) (NCS)2). In combination with an organic hole-transporting material (spiro-MeOTAD, 2,2′,7,7′-tetrakis-(N,N-di-p-methoxyphenylamine) 9, 9′-spirobifluorene), the C101 sensitizer exhibits an excellent power-conversion efficiency of 4.5% under AM 1.5 solar (100 mW cm−2) irradiation in a SSDSC. From electronic-absorption, transient-photovoltage-decay, and impedance measurements it is inferred that extending the π-conjugation of spectator ligands induces an enhanced light harvesting and retards the charge recombination, thus favoring the photovoltaic performance of a SSDSC.

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