4,4鈥?5,5鈥?Tetracarboxy-2,2鈥?bipyridine Ru(II) Sensitizers for Dye-Sensitized Solar Cells

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• 作者：Chun-Cheng Chou ; Fa-Chun Hu ; Kuan-Lin Wu ; Tainan Duan ; Yun Chi ; Shih-Hung Liu ; Gene-Hsiang Lee ; Pi-Tai Chou
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：August 18, 2014
• 年：2014
• 卷：53
• 期：16
• 页码：8593-8599
• 全文大小：382K
• ISSN：1520-510X

文摘

Two Ru(II) sensitizers TCR-1 and TCR-2 bearing four carboxy anchoring groups were prepared using 4,4鈥?5,5鈥?tetraethoxycarbonyl-2,2鈥?bipyridine chelate and 4-(5-hexylthien-2-yl)-2-(3-trifluoromethyl-1H-pyrazol-5-yl)pyridine and 6-t-butyl-1-(3-trifluoromethyl-1H-pyrazol-5-yl)isoquinoline, respectively. Dissolution of these sensitizers in DMF solution afforded a light green solution up to 10^鈥? M, for which their color gradually turned red upon further dilution and deposition on the surface of a TiO₂ photoanode due to the spontaneous deprotonation of carboxylic acid groups. These sensitizers were characterized using electrochemical means and structural analysis time-dependent density functional theory (TDDFT) simulation and were also subjected to actual device fabrication. The as-fabricated DSC devices showed overall efficiencies 畏 = 6.16% and 6.23% versus their 4,4鈥?dicarboxy counterparts TFRS-2 and TFRS-52 with higher efficiencies of 7.57% and 8.09%, using electrolyte with 0.2 M LiI additive. Their inferior efficiencies are possibly caused by the combination of blue-shifted absorption on TiO₂, inadequate dye loading, and the perpendicularly oriented central carboxy groups.