Abstract
Two new thiocyanato-free Ru sensitizers GS1 and GS2 having substitutions at the central pyridyl group of the terpyridine ligand successfully synthesized. GS1 and GS2 were used as photosensitizers for DSSCs devices. These sensitizers were characterized by 1H NMR, FT-IR, UV–visible, and differential pulse voltammetry studies. The optical and electrochemical properties of these sensitizers were compared with N749 dye. The fabricated device with these complexes portrays an efficient panchromatic sensitization which covers the entire region from visible to NIR. Time-correlated single photon counting (TCSPC) experiment was also performed to study the charge carrier dynamics of both the sensitizers. The average excited state-life time of the GS1 and GS2 sensitizers on TiO2 is 4.04 ns and 3.07 ns respectively, which was much better compared to the reference sensitizer (0.25 ns). Among these two sensitizers, GS2 exhibited a maximum overall power conversion efficiency of 3.25% under standard air mass 1.5 irradiation (100 mW cm−2) with the Jsc = 10.073 mA/cm2, the Voc = 0.451 V, and the FF = 0.714.
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