Investigation of Temperature and Aging Effects in Nanostructured Dye Solar Cells Studied by Electrochemical Impedance Spectroscopy
Figure 1
Equivalent circuit used for the EIS spectra fits. : series resistance of the cell. transmission line element, as introduced by Bisquert, Fabregat-Santiago et al. (e.g., [24]), modeling the photoelectrode and including the photoelectrode resistance (consisting of the electron diffusion resistance in the TiO2 film () and the recombination resistance on the TiO2-dye-electrolyte interface (): i.e., ) and the constant phase element , describing the capacitance of the TiO2 film surface. : charge transfer resistance on the counter electrode—electrolyte interface. : constant phase element describing the counter electrode capacitance. : Warburg element associated with the diffusion in the electrolyte. Constant phase elements were used instead of pure capacitances because they describe better a realistic, uneven, and unhomogenous electrode surface [41].
