Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Dye-sensitized solar cells (DSCs) consist of a mesoporous titania layer that is sensitized with a dye, and an electrolyte. Both are sandwiched between two conducting glass slides. The key for the understanding of these devices lies in the interfacial processes. The surface modification of the titania causes changes in its material properties like e.g. the conduction band level. Hence, in order to investigate the interfacial processes the corresponding material combinations have to be tested under operating conditions. Impedance spectroscopy is the method of choice for this task. For interpretation and fitting of the spectra the device is described using an electrical equivalent circuit. The material parameters can then be simply extracted or calculated from the fit to the recorded spectrum.
We applied impedance spectroscopy for the investigation of complete DSCs with the carotenoid sensitizers bixin, crocetin and torularhodin (see Fig. 1). Furthermore, we tested counter electrodes alone by using dummy cells that contained a second counter electrode instead of the photo anode. We could resolve that the difference in conversion efficiency between DSCs with the different carotenoid sensitizers are only partially explained by conduction band shifts. The main difference was found to be the electron injection efficiency from the dye to the titania. EIS on the counter electrodes showed that the stability of the cell does not only depend on the sensitized interface but also on the counter electrode and the electrolyte species.
Figure 1: Structures of the organic sensitizers with the impedance spectra of the corresponding DSCs. The spectra were fitted with an equivalent circuit based on a transmission line model.
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