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Highly Efficient Solid-State Dye-Sensitized Solar Cells Based on Triphenylamine Dyes

Authors

  • Xiao Jiang,

    1. Center of Molecular Devices, School of Chemical Science and Engineering, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
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  • Karl Martin Karlsson,

    1. Center of Molecular Devices, School of Chemical Science and Engineering, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
    2. Organic Chemistry, Department of Chemistry, School of Chemical Science and Engineering, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
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  • Erik Gabrielsson,

    1. Center of Molecular Devices, School of Chemical Science and Engineering, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
    2. Organic Chemistry, Department of Chemistry, School of Chemical Science and Engineering, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
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  • Erik M. J. Johansson,

    1. Center of Molecular Devices, School of Chemical Science and Engineering, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
    2. Department of Physical and Analytical Chemistry, Uppsala University, Box 259, SE-751 05 Uppsala, Sweden
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  • Maria Quintana,

    1. Center of Molecular Devices, School of Chemical Science and Engineering, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
    2. Department of Physical and Analytical Chemistry, Uppsala University, Box 259, SE-751 05 Uppsala, Sweden
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  • Martin Karlsson,

    1. Center of Molecular Devices, School of Chemical Science and Engineering, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
    2. Department of Physical and Analytical Chemistry, Uppsala University, Box 259, SE-751 05 Uppsala, Sweden
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  • Licheng Sun,

    1. Center of Molecular Devices, School of Chemical Science and Engineering, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
    2. Organic Chemistry, Department of Chemistry, School of Chemical Science and Engineering, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
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  • Gerrit Boschloo,

    Corresponding author
    1. Center of Molecular Devices, School of Chemical Science and Engineering, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
    2. Department of Physical and Analytical Chemistry, Uppsala University, Box 259, SE-751 05 Uppsala, Sweden
    • Center of Molecular Devices, School of Chemical Science and Engineering, Royal Institute of Technology, SE-100 44 Stockholm, Sweden.
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  • Anders Hagfeldt

    Corresponding author
    1. Center of Molecular Devices, School of Chemical Science and Engineering, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
    2. Department of Physical and Analytical Chemistry, Uppsala University, Box 259, SE-751 05 Uppsala, Sweden
    • Center of Molecular Devices, School of Chemical Science and Engineering, Royal Institute of Technology, SE-100 44 Stockholm, Sweden.
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Abstract

Two triphenylamine-based metal-free organic sensitizers, D35 with a single anchor group and M14 with two anchor groups, have been applied in dye-sensitized solar cells (DSCs) with a solid hole transporting material or liquid iodide/triiodide based electrolyte. Using the molecular hole conductor 2,2',7,7'-tetrakis-(N,N-di-p-methoxyphenyl-amine)9,9'-spirobifluorene (spiro-OMeTAD), good overall conversion efficiencies of 4.5% for D35 and 4.4% for M14 were obtained under standard AM 1.5G illumination (100 mW cm−2). Although M14 has a higher molar extinction coefficient (by ∼ 60%) and a slightly broader absorption spectrum compared to D35, the latter performs slightly better due to longer lifetime of electrons in the TiO2, which can be attributed to differences in the molecular structure. In iodide/triiodide electrolyte-based DSCs, D35 outperforms M14 to a much greater extent, due to a very large increase in electron lifetime. This can be explained by both the greater blocking capability of the D35 monolayer and the smaller degree of interaction of triiodide (iodine) with D35 compared to M14. The present work gives some insight into how the molecular structure of sensitizer affects the performance in solid-state and iodide/triiodide-based DSCs.

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