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Dual-Function Smart Electrolyte for Dye-Sensitized Solar Cells: 5-Mercaptotetrazoles as Redox Mediator and Corrosion Repressor

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    Dual-Function Smart Electrolyte for Dye-Sensitized Solar Cells: 5-Mercaptotetrazoles as Redox Mediator and Corrosion Repressor
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    † †Department of Materials Science and Engineering and ‡School of Chemistry, Monash University, Melbourne, Victoria 3800, Australia
    § Materials Science and Engineering, CSIRO, Clayton South, Victoria 3169 Australia
    ∥ Physik-Department, Technische Universität München, James-Franck-Strasse 1, 85748 Garching, Germany
    ⊥ The Melbourne Centre for Nanofabrication, 151 Wellington Road, Clayton South, Victoria 3169, Australia
    *E-mail: [email protected]. Phone: +61 (0) 3 9905 6264.
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    The Journal of Physical Chemistry C

    Cite this: J. Phys. Chem. C 2015, 119, 34, 19613–19618
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    https://doi.org/10.1021/acs.jpcc.5b05195
    Published August 3, 2015
    Copyright © 2015 American Chemical Society
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    Abstract

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    Metal charge collectors are an essential component of photovoltaic modules, facilitating charge collection over larger areas. Their application in dye-sensitized solar cells has so far been hampered by two major factors: (1) the redox mediators employed in these photoelectrochemical devices are generally corrosive to metals, and (2) they generally show low overpotentials for their redox reactions on these metal surfaces, which leads to significant recombination losses at the photoanode. Here, a thiolate-based redox mediator, sodium 1-phenyl-1H-5-mercaptotetrazole (Tph), is shown to form self-assembled monolayers on silver electrodes and to act as an effective corrosion protection layer while also exhibiting high overpotentials on these metals at the photoanode. The anticorrosive properties are strongly dependent on the structure of the thiolate. Replacement of the phenyl group in Tph with a methyl substituent accelerates the corrosion process by orders of magnitude. Finally, we demonstrate the applicability of Tph-based electrolytes in a 60 cm2 dye-sensitized solar cell comprising unprotected silver charge-collecting electrodes.

    Copyright © 2015 American Chemical Society

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.jpcc.5b05195.

    • Details on the used chemicals and materials and device fabrication and characterization, as well as chemical structures, representative J–V curves, tabulated J–V data, large area device data, and photographs of the large area devices (PDF)

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    The Journal of Physical Chemistry C

    Cite this: J. Phys. Chem. C 2015, 119, 34, 19613–19618
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.jpcc.5b05195
    Published August 3, 2015
    Copyright © 2015 American Chemical Society
    Request reuse permissions

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