Charge Recombination Kinetics in Dye-Sensitized Nanocrystalline Titanium Dioxide Films under Externally Applied Bias
Citations Over TimeTop 1% of 1998 papers
Abstract
The kinetics of charge recombination were determined following low intensity optical excitation of RuII(2,2‘-bipyridyl-4,4‘dicarboxylate)2(NCS)2 sensitized nanocrystalline TiO2 films as a function of externally applied bias voltage V. These kinetics were found to be multiexponential. The median time (t50%) for charge recombination was found to depend strongly upon bias voltage, reducing from t50% ∼ 200 ms for V = 0 V versus Ag/AgCl to < 30 ns for V ≤ −500 mV. This reduction in t50% was found to follow the equation t50% ∝ exp(qV/1.7kBT). These results are consistent with the charge recombination kinetics being strongly dependent upon the accumulation of electrons in intraband/conduction band states of the TiO2 film. For biases V ≤ −400 mV, the rate of charge recombination was found to exceed the rate of rereduction of the dye cation by an I-/I3- redox couple in solution.
Related Papers
- Nanocrystalline Apatite-Based Biomaterials(2011)
- → Electrode characteristics of nanocrystalline AB5 compounds prepared by mechanical alloying(1998)10 cited
- → Electrochemical behavior of different structural states of the alloy Ti60Ni40(2011)5 cited
- → X-ray absorption studies of nanocrystalline Ni(1997)12 cited
- → Structure property relations of chemically synthesized nanocrystalline PZT powders(2001)7 cited