Halogen Bonding Promotes Higher Dye-Sensitized Solar Cell Photovoltages

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• 作者：Sarah J. C. Simon ; Fraser G. L. Parlane ; Wesley B. Swords ; Cameron W. Kellett ; Chuan Du ; Brian Lam ; Rebecca K. Dean ; Ke Hu ; Gerald J. Meyer ; Curtis P. Berlinguette
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：August 24, 2016
• 年：2016
• 卷：138
• 期：33
• 页码：10406-10409
• 全文大小：266K
• 年卷期：0
• ISSN：1520-5126

文摘

We report here an enhancement in photovoltage for dye-sensitized solar cells (DSSCs) where halogen-bonding interactions exist between a nucleophilic electrolyte species (I^–) and a photo-oxidized dye immobilized on a TiO₂ surface. The triarylamine-based dyes under investigation showed larger rate constants for dye regeneration (k_reg) by the nucleophilic electrolyte species when heavier halogen substituents were positioned on the dye. The open-circuit voltages (V_OC) tracked these k_reg values. This analysis of a homologous series of dyes that differ only in the identity of two halogen substituents provides compelling evidence that the DSSC photovoltage is sensitive to k_reg. This study also provides the first direct evidence that halogen-bonding interactions between the dye and the electrolyte can bolster DSSC performance.