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The electron transport in electrolyte filled nanoporous TiO2 and the influence of circuit condition on the electron transport, by means of photovoltage transient are discussed. Photovoltage transients are measured with electrodes having various thicknesses, showing that the transit time was nearly proportional to the square of the electrode thickness.

A study was conducted to examine the performances of dye-sensitized solar cells prepared from nanoporous TiO2 films with different TiO2 nanoparticle preparation methods and different annealing temperatures with various film thicknesses. The result reveals that the solar cells prepared at higher annealing temperatures have higher energy conversion efficiencies.

The pulsed laser-induced current transients from the same nanoporous TiO2 electrodes both in the presence and in the absence of bias light are measured. Regardless of the methods, the derived electron diffusion coefficients (D) values from the transients are found in the same order and dependency on electron density. This suggests that both methods can be used to compare electron transport properties among different nanoporous films.

The influences of particle size in dye-sensitized solar cells on diffusion coefficient of electrons and electron recombination lifetime were calculated. The implications of particle size to solar cell efficiency are discussed.

The transport of photogenerated electrons in nanoporous TiO2 electrodes is examined in a lithium perchlorate electrolyte solution by laser-induced photocurrent transient measurements. The diffusion coefficients of the photoelectrons are found to depend on the lithium ion concentration in the solution.