Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
It is known that the introduction of benzimidazole group into the triphenylamine core increases the molar extinction coefficients and λmax values [1]. Incorporation of benzimidazole at triphenylamine is known to delay charge recombination of the electrons in the conduction band of TiO2 with the oxidized dyes in dye-sensitized solar cells (DSSCs) [2]. In this study, novel donor-acceptor organic dyes TPA5a-c containing triphenylamine-benzimidazole hybrid donor and 2-cyanoacetic acid acceptor have been synthesized and applied in DSSCs. The impact of the substituents in the dyes on the optical properties and device performance have been investigated in detail. TPA5a-c dyes show broad absorption bands around 430 nm, corresponding to the n-pi* transition absorption bands of the molecules both in solutions and on TiO2-coated substrates. Fluorescence quenching experiments indicated that TPA5a dye carrying methoxy donor units shows an efficient electron injection from its excited level to the conduction band of TiO2.
All synthesized dyes have suitable energy levels confirmed by cyclic voltammetry measurements to inject electron into the conduction band of TiO2. In DSSC devices TPA5a,TPA5b andTPA5c gave efficiencies of 4.31%, 2.65% and 2.57%, respectively. The DSSC based on organic dye TPA5a displayed a short-circuit current (Jsc) of 9.03 mA cm−2, an open-circuit voltage (Voc) of 740 mV, and a fill factor (ff) of 0.64. Also, DSSC based on TPA5a dyes gives the highest and broadest EQE curve in the graph with the value of 71% at 460 nm among the devices using the other synthesized dyes as sensitizers.
Current-voltage (J-V) characteristics of DSSCs based on TPA5a-c dyes adsorbed on TiO2.
[1] Zhou, L. L.; Jia, C. Y.; Wan, Z. Q.; Li, Z.; Bai, J. Y.; Zhang, L. G.; Zhang, J. Q.; Yao, X. J. Triphenylamine-Based Organic Dyes Containing Benzimidazole Derivatives for Dye-Sensitized Solar Cells. Dyes Pigments 2012, 95, 743-750. [2] Tsai, M. S.; Hsu, Y. C.; Lin, J. T.; Chen, H. C.; Hsu, C. P. Organic Dyes Containing 1H-phenanthro 9,10-d imidazole Conjugation for Solar Cells. J Phys Chem C 2007, 111, 18785-18793.
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