Abstract
Femtosecond time-gated fluorescence and nanosecond flash photolysis studies of seven complete, real titania nanoparticle solar cells sensitized with an efficient organic dye (TH305) were performed in order to investigate the role of the electrolyte composition on the charge transfer dynamics. The electron injection rate constants were found to range from 0.4 to 3.5 ps–1 in iodide-based electrolyte, and they well correlate with the shift of the conduction band edge potential of titania. The lithium cation additives resulted in 2 times faster electron injection rate constant (3.55 ps–1) with respect to that when larger sodium cations were used (1.86 ps–1). However, in the presence of a pyridine derivative component in the electrolyte solution, the electron injection rate constant decreased several times (0.38 ps–1 for Li+ and 0.54 ps–1 for Na+), while the electron injection efficiency was found to be still very high, 96–100%. The dye regeneration by the redox couple under relatively low fluence of excitatio...
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