| Summary: | 碩士 === 國立虎尾科技大學 === 光電與材料科技研究所 === 97 === In this present work, highly ordered and large surface area TiO2 nanotube arrays structure were prepared by anodic titanium oxide (ATO) method for the fabrication of the photoelectrode of the dye-sensitized solar cell(DSSC).
Here, we focused on the discussion of cell efficiency for different solvent with water-base, Methanol-base and ethylene glycol-base composed of hydrofluoric acid (HF) or ammonium fluoride (NH4F).The TiO2 nanotubes were grow by anodization in different electrolytes at different potential between 15V and 60V, average pores diameter of 20nm to 100nm, whereas tubes length were 133nm to 767nm as observed by FESEM. In this process, for a fixed concentration and anodization potential, different tube structure could be produced by controlling the water contain of electrolyte. The influence of water content in the electrolyte on the fabrication of TiO2 nanotubes were investigated, when the ratio of water to solvent increase over then 50wt%, it was difficult to produce uniform nanotubes and the current density was hard to control precisely. Much higher current density and current fluctuation were observed in the water-base electrolyte than in the alcohol-base electrolyte. We conjectured that higher diffusivity and concentration of ions in the water-base electrolyte. Therefore, different efficiency was present under different water content, because it impacts the property of TiO2 nanotubes and the amount of dye loading.
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