Thin Solid Films, Vol.403-404, 242-246, 2002
Electrical characterisation of dye sensitised nanocrystalline TiO2 solar cells with liquid electrolyte and solid-state organic hole conductor
This article investigates electronic properties of nanoporous dye sensitised solar cells. We compare devices with a liquid electrolyte to those containing an organic hole conductor as contacting medium to the dye. Both types of solar cells differ by their reference energies for recombination and especially. by their recombination probabilities of photo-injected electrons from the titanium dioxide into the respective contact medium. For moderate forward voltages up to the range of the open circuit voltage, the admittance of the electrolyte cell is dominated by diffusion and recombination of electrons within the titanium dioxide. The impedance of the solid-state device is dominated by a negative reactance. i.e. an inductive behaviour, which we attribute to conductivity modulation in the hole conductor.