In dye-sensitized solar cells (DSSCs) fabricated with azobenzene and azulene derivatives as the photosensitizing dyes, the replacement of the conventional I3-/I-redox mediator with Br3-/Br-redox mediator possessing more positive redox potential has been examined to improve open-circuit photovoltages (Voc) of the cells. The cells with the Br3-/Br-redox mediator exhibited highVocof ~0.8 V, resulting in higher light-to-electric energy conversion efficiencies (η) than the cells with the I3-/I-redox mediator by a factor of 1.7 under the simulated sunlight irradiation (AM-1.5G, 100 mW cm-2). The results indicate a high potential of the Br3-/Br-redox mediator in DSSCs.
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Kakiage et al. (2013) studied this question.
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