| Summary: | 碩士 === 國立虎尾科技大學 === 電子工程系碩士班 === 103 === In this study, we used electrochemical anodization method to prepare TiO2 nanotubes arrays and hydrothermal method to prepare TiO2 nanorods, and applied them on the photo-electrodes of dye-sensitized solar cells (DSSCs). The nanostructures and photo-electrodes were investigated by field emission scanning electron microscopy (FE-SEM), X-ray Diffraction (XRD) , I-V character-istic analyses, Ultraviolet-visible spectroscopy (UV-vis), and incident Photon conversion effi-ciency (IPCE). Through XRD analysis, annealing of TiO2 nanotubes and TiO2 nanorods have better anatase phase. Then by FE-SEM analysis showed that the length of the TiO2 nanotubes and TiO2 nanorods are 5 μm. In the same column nanotubes and nanorods are 5 μm prepared by dye-sensitized solar cells, and the use of solar simulator light power of AM 1.5 100 mW/cm2 in the measurement, the conversion efficiency of TiO2 nanotube photo-electrodes under back-illuminated and front-illuminated were 2.63% and 4.24%, the conversion efficiency of TiO2 nanorods photo-electrode under front-illuminated was 0.81%. After TiCl4, the walls of TiO2 nanotubes were coated with TiO2 nanoparticles. To enlarge the space between TiO2 nanorods, we put TiO2 nanorods in the liquid of HCl to etch them. These could provide large surface area of TiO2 nanotubes and nanorods to adsorb dye, resulting in the improvement of conversion efficiency for DSSCs. After TiCl4 treatments, the best conversion efficiency of TiO2 nanotubes under back-illuminated and front-illuminated were 3.54 % and 5.07 %, and after HCl treatments, the best conversion efficiency of TiO2 nanorods under front-illuminated was 1.35 %, respectively.
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