Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
The commonly used electrolyte components of dye sensitized solar cells, 3-methoxypropionitrile (MPN), 1-methyl-benzimidazole (NMBI), guanidinium thiocyanate (GuSCN), and 1-propyl-3-methylimidazolium iodide (PMII) were purified in order to investigate their influence on the solar cell efficiency and dye stability using the ruthenium dye N719 as the model sensitizer. Dye samples were extracted from the prepared solar cells and analyzed by liquid chromatography – mass spectrometry (LC-MS) (Figure 1). Several previously known degradation products were detected with the main degradation product corresponding to the NMBI derivative of N719. Purification of the electrolyte components did not significantly alter the dye degradation characteristics. Dye degradation was observed in cells at low temperatures when the cells were exposed to light. In the literature, similar degradation has been reported, but only at high temperatures. Purification of the electrolyte solvent MPN results in increased cell lifetime. Purification of the other electrolyte components did not significantly influence the cell efficiency or stability.
Figure 1. UV-chromatogram of the degraded N719 dye sample extracted from a solar cell. Peak 3 corresponding to [RuL2(NCS)(SCN)] is an impurity in the starting material.
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