Convergent/Divergent Synthesis of a Linker-Varied Series of Dyes for Dye-Sensitized Solar Cells Based on the D35 Donor

Authors

  • Erik Gabrielsson,

    1. School of Chemical Science and Engineering, Center of Molecular Devices, Department of Chemistry, KTH Royal Institute of Technology, Stockholm, Sweden
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  • Hanna Ellis,

    1. Department of Chemistry – Ångström Laboratory, Physical Chemistry, Uppsala University, Uppsala, Sweden
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  • Sandra Feldt,

    1. Department of Chemistry – Ångström Laboratory, Physical Chemistry, Uppsala University, Uppsala, Sweden
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  • Haining Tian,

    1. School of Chemical Science and Engineering, Center of Molecular Devices, Department of Chemistry, KTH Royal Institute of Technology, Stockholm, Sweden
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  • Gerrit Boschloo,

    1. Department of Chemistry – Ångström Laboratory, Physical Chemistry, Uppsala University, Uppsala, Sweden
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  • Anders Hagfeldt,

    1. Department of Chemistry – Ångström Laboratory, Physical Chemistry, Uppsala University, Uppsala, Sweden
    2. State Key Laboratory of Fine Chemicals, DUT-KTH Joint Education and Research Centre on Molecular Devices, Dalian University of Technology, Dalian, P. R. China
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  • Licheng Sun

    Corresponding author
    1. School of Chemical Science and Engineering, Center of Molecular Devices, Department of Chemistry, KTH Royal Institute of Technology, Stockholm, Sweden
    2. State Key Laboratory of Fine Chemicals, DUT-KTH Joint Education and Research Centre on Molecular Devices, Dalian University of Technology, Dalian, P. R. China
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Abstract

A series of four new dyes, based on the D35 type donor moiety with varied linker units, is synthesized using a facile convergent/divergent method, enabled by an improved synthesis of the D35 donor. The dyes are evaluated in dye sensitized solar cells with Co(II/III)(bpy)3-based electrolytes. By extending the linker fragment, higher photocurrents and solar energy conversion efficiencies are achieved. It is also found that the linker unit plays a crucial role in maintaining a high open-circuit photovoltage. Based on the photovoltaic performance it is concluded that the hexylthiophene unit is the most suitable for this purpose, as it allows further enhancement of the already high open-circuit voltage of D35 to 0.92 V. The best dye in this series reaches an efficiency of 6.8%.

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