Fabrication and Characterization of TiO2 Nanoparticles, Nanorods, and Their Composites Used as Working Electrodes for Dye-Sensitized Solar Cells (DSSC)
| Autor: | Chen, Li-Ching, 陳俐靜 |
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| Rok vydání: | 2009 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 97 In this thesis, we have attempted to fabricate a dye-sensitized solar cell(DSSC) based on the highly crystalline TiO2 nanorods prepared with the surfactant-assisted hydrothermal method. To estimate the performance of the cell composed of the TiO2 nanorods, a cell composed of TiO2 nanoparticles prepared with sol-gel method was fabricated as a reference. The microstructure measured by FESEM and X-ray diffraction was a pure highly crystalline anatase phase with lengths of 100 nm-200 nm and diameters of 20 nm-30 nm. The performance of nanorod solar cells were compared with pure nanoparticle cells at a series of film thickness. With increase of film thickness, the current density of TiO2 nanorod cells showed a continuous increase in the whole thickness range up to 26 μm, indicating the rapid electron transport rate and the light scattering effect of nanorods. However, the much smaller specific surface area of nanorods than nanoparticles was a major problem. Therefore, we tried to improve the current density by TiCl4 treatment, light-scattering TiO2 layer, and interfacial layer. The overall efficiency of TiO2 nanorods could be improved from 6.5% to 7.8%. We also fabricated a cell based on the composites of TiO2 nanorods and nanoparticles. Five pastes containing mixed TiO2 nanoparticles and nanorods were prepared with nanorods concentration of 20 wt %、33 wt %、50 wt %、67 wt %, and 80 wt %, respectively. Among all the cells we prepared, the best efficiency was 7.9%. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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