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  • Title: Enhancing the stability of porphyrin dye-sensitized solar cells by manipulation of electrolyte additives.
    Author: Lau GP, Tsao HN, Yi C, Zakeeruddin SM, Grätzel M, Dyson PJ.
    Journal: ChemSusChem; 2015 Jan; 8(2):255-9. PubMed ID: 25488713.
    Abstract:
    The use of porphyrin-based photosensitizers with superior light-harvesting properties has enabled the power conversion efficiency of dye-sensitized solar cells (DSCs) to reach 13 % under full sun illumination. However, a major limitation of such devices corresponds to the volatility of the solvent used so far for the electrolyte, which prevents practical applications. In this work, we describe a porphyrin-ionic liquid DSC, which not only affords the highest efficiency reported to date, but is also stable for more than 300 h under continuous full sun illumination at 60 °C. Furthermore, we identify a previously unreported pathway for device degradation, and show that the addition of N-methylbenzimidazole and a thiocyanate salt to the electrolyte is critical to obtaining long-lived devices.
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