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Triphenylamine Groups Improve Blocking Behavior of Phenoxazine Dyes in Cobalt-Electrolyte-Based Dye-Sensitized Solar Cells

Authors

  • Dr. Yan Hao,

    1. Department of Chemistry-Ångström Laboratory, Center of Molecular Devices, Uppsala University, Box 523, 751 20 Uppsala (Sweden)
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  • Dr. Haining Tian,

    1. School of Chemical Science and Engineering, Center of Molecular Devices, Department of Chemistry, Royal Institute of Technology (KTH), Teknikringen 30,100 44 Stockholm (Sweden)
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  • Dr. Jiayan Cong,

    1. School of Chemical Science and Engineering, Center of Molecular Devices, Department of Chemistry, Royal Institute of Technology (KTH), Teknikringen 30,100 44 Stockholm (Sweden)
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  • Wenxing Yang,

    1. Department of Chemistry-Ångström Laboratory, Center of Molecular Devices, Uppsala University, Box 523, 751 20 Uppsala (Sweden)
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  • Ilkay Bora,

    1. School of Chemical Science and Engineering, Center of Molecular Devices, Department of Chemistry, Royal Institute of Technology (KTH), Teknikringen 30,100 44 Stockholm (Sweden)
    2. Institute of Organic Chemistry, University of Stuttgart, 70049 Stuttgart (Germany)
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  • Prof. Licheng Sun,

    1. School of Chemical Science and Engineering, Center of Molecular Devices, Department of Chemistry, Royal Institute of Technology (KTH), Teknikringen 30,100 44 Stockholm (Sweden)
    2. State Key Laboratory of Fine Chemicals, DUT-KTH Joint Education and Research Center for Molecular Devices, Dalian University of Technology (DUT), 2#Linggong Road, 116024 Dalian (China)
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  • Dr. Gerrit Boschloo,

    Corresponding author
    1. Department of Chemistry-Ångström Laboratory, Center of Molecular Devices, Uppsala University, Box 523, 751 20 Uppsala (Sweden)
    • Department of Chemistry-Ångström Laboratory, Center of Molecular Devices, Uppsala University, Box 523, 751 20 Uppsala (Sweden)

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  • Prof. Anders Hagfeldt

    1. Department of Chemistry-Ångström Laboratory, Center of Molecular Devices, Uppsala University, Box 523, 751 20 Uppsala (Sweden)
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Abstract

Novel phenoxazine dyes are successfully introduced as sensitizers into dye-sensitized solar cells (DSCs) with cobalt-based electrolyte. In sensitizers with triphenylamine (TPA) groups recombination from electrons in the TiO2 conduction band to the cobalt(III) species is suppressed. The effect of the steric properties of the phenoxazine sensitizers on the overall device performance and on recombination and regeneration processes is compared. Optimized DSCs sensitized with IB2 having two TPA groups in combination with tris(2,2′-bipyridyl) cobalt(II/III) yield efficiencies of 6.3 %, similar to that of IB3, which is equipped with mutiple alkoxy groups. TH310 with only one TPA group gives lower efficiency and open circuit voltage, while IB1 without TPA groups performs even worse. These results demonstrate that both TPA groups on the IB2 are needed for an efficient blocking effect. These results reveal a possible new role for TPA units in DSC sensitizer design.

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