Phenothiazinedioxide-Conjugated Sensitizers and a Dual-TEMPO/Iodide Redox Mediator for Dye-Sensitized Solar Cells

Authors

  • Ryan Yeh-Yung Lin,

    1. Institute of Chemistry, Academia Sinica, Nankang 11529, Taipei (Taiwan) a.edu.tw
    2. Department of Chemical Engineering, National Taiwan University, Taipei 10617 (Taiwan)
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  • Te-Chun Chu,

    1. Department of Chemical Engineering, National Taiwan University, Taipei 10617 (Taiwan)
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  • Ping-Wei Chen,

    1. Department of Chemical Engineering, National Taiwan University, Taipei 10617 (Taiwan)
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  • Jen-Shyang Ni,

    1. Institute of Chemistry, Academia Sinica, Nankang 11529, Taipei (Taiwan) a.edu.tw
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  • Pei-Chieh Shih,

    1. Department of Chemical Engineering, National Taiwan University, Taipei 10617 (Taiwan)
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  • Yung-Chung Chen,

    1. Institute of Chemistry, Academia Sinica, Nankang 11529, Taipei (Taiwan) a.edu.tw
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  • Prof. Kuo-Chuan Ho,

    Corresponding author
    1. Department of Chemical Engineering, National Taiwan University, Taipei 10617 (Taiwan)
    2. Institute of Polymer Science and Engineering, National Taiwan University, Taipei 10617 (Taiwan)
    • Kuo-Chuan Ho, Department of Chemical Engineering, National Taiwan University, Taipei 10617 (Taiwan)===

      Jiann T. Lin, Institute of Chemistry, Academia Sinica, Nankang 11529, Taipei (Taiwan) a.edu.tw===

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  • Prof. Jiann T. Lin

    Corresponding author
    1. Institute of Chemistry, Academia Sinica, Nankang 11529, Taipei (Taiwan) a.edu.tw
    • Kuo-Chuan Ho, Department of Chemical Engineering, National Taiwan University, Taipei 10617 (Taiwan)===

      Jiann T. Lin, Institute of Chemistry, Academia Sinica, Nankang 11529, Taipei (Taiwan) a.edu.tw===

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Abstract

Metal-free dyes containing a phenothiazinedioxide entity in the spacer were synthesized. The best conversion efficiency (7.47 %) of the dye-sensitized solar cell (DSSC) by using new sensitizers with chenodeoxycholic acid as a co-adsorbent and the I/I3 electrolyte reached over 90 % of that of the standard N719-based cell (8.10 %). A new type of ionic liquid containing the nitroxide radical (N[BOND]O.) and iodide was successfully synthesized and applied to the DSSCs. If the I/I3 electrolyte was replaced with a dual redox electrolyte, that is, a TEMPO (2,2,6,6-tetramethylpiperidin-1-oxyl) derivative with a dangling imidazolium iodide entity, the cell exhibited a high open-circuit voltage of 0.85 V and a cell efficiency of 8.36 %.

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