Abstract
1 min readA new high molar extinction coefficient ruthenium(II) bipyridyl complex “ cis -Ru(4,-bis(9,9-dibutyl-7-(3,6-di-tert-butyl-9H-carbazol-9-yl)-9H-fluoren-2-yl)-2,-bipyridine)(2,-bipyridine-4,-dicarboxylic acid)(NCS) 2 , BPFC ” has been synthesized and characterized by FT-IR, -NMR, and ESI-MASS spectroscopes. The sensitizer showed molar extinction coefficient of M −1 cm −1 , larger as compared to the reference N 719, which showed M −1 cm −1 . The test cells fabricated using BPFC sensitizer employing high performance volatile electrolyte, ( E 01) containing 0.05 M I 2 , 0.1 M LiI, 0.6 M 1,2-dimethyl-3- n -propylimidazolium iodide, 0.5 M 4- tert -butylpyridine in acetonitrile solvent, exhibited solar-to-electric energy conversion efficiency ( η ) of 4.65% (short-circuit current density () = 11.52 mA/cm 2 , open-circuit voltage () = 566 mV, fill factor = 0.72) under Air Mass 1.5 sunlight, lower as compared to the reference N 719 sensitized solar cell, fabricated under similar conditions, which exhibited η -value of 6.5% ( = 14.3 mA/cm 2 , = 640 mV, fill factor = 0.71). UV-Vis measurements conducted on TiO 2 films showed decreased film absorption ratios for BPFC as compared to those of reference N 719. Staining TiO 2 electrodes immediately after sonication of dye solutions enhanced film absorption ratios of BPFC relative to those of N 719. Time-dependent density functional theory (TD-DFT) calculations show higher oscillation strengths for 4,-bis(9,9-dibutyl-7-(3,6-di-tert-butyl-9H-carbazol-9-yl)-9H-fluoren-2-yl)-2,-bipyridine relative to 2,-bipyridine-4,-dicarboxylic acid and increased spectral response for the corresponding BPFC complex.
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