| Summary: | 碩士 === 國立東華大學 === 化學系 === 96 === With the advantages of being economic, environmentally benign, and easy preparation, dye-sensitized solar cells (DSSCs) have gained much attention in recent years. In this study we discuss how the compositions of TiO2 working electrode and electrolyte affect the overall efficiency of DSSCs. The film thickness could be controlled by varying the concentration of TiO2 paste. The crystallinity affected the efficiency. Anatase was shown to be better than rutile. It was found that upon UV irradiation, the dispersion of TiO2 particles and the DSSC efficiency were both improved. The working electrode was also prepared by glazing angle deposition (GLAD) method, and the films were composed of crystalline nanocolumns. The overall efficiency was improved from 1.1% to 3.6% as the film thickness increased.
For the electrolyte, the concentrations of LiI and 4TBP were varied. As the concentration of LiI increased, VOC decreased and JSC increased. While with the increase of 4TBP concentration, VOC increased and JSC decreased. We also found that VOC, JSC, and overall conversion efficiency of DSSCs were all improved by addition ionic liquids, including 1-alkyl-3-methylimidazoium iodide and 1-alkylpyridium iodide tested in this study.
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