Methods for Spectral Responsivity Measurements of Dye-Sensitized Solar Cells

概要

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The various methods of spectral responsivity measurements for dye-sensitized solar cells (DSCs) were investigated using two starkly different types of cells: one cell involving a 3-Methoxypropionitrile (MPN) as a solvent of an electrolyte and the other, an ionic liquid electrolyte. A linear relationship was observed between the short-circuit current and monochromatic light intensity in the range of 0.05 to 4.0 mW cm−2, not only for the MPN based cell but also for the ionic liquid based cell, although the current response of the ionic liquid based cell was slower probably due to the high electrolyte viscosity. It was found that correct spectral responsivity measurements could be performed by a conventional AC method in which the chopping frequency was adjusted low enough to obtain a steady state current under illumination conditions similar to practical applications. While the spectral responsivity determined by the DC method was higher than that by the AC method under white bias irradiation, the DC method may be considered useful to compare the spectral responsivity of DSCs prepared by different manufacturers since errors caused by the use of a different bias light source by individual manufacturers would be eliminated.