| Summary: | 碩士 === 國立東華大學 === 電子工程研究所 === 97 === My experiment have fabricated various sculptured porous nano columnar titanium oxide films by glancing angle deposition (GLAD) method using ion-assisted electron-beam evaporation (IBAD) system and used the films for the application as photoanode in the dye-sensitized solar cell (DSSC). Parameters like the glancing of GLAD, substrate rotation speed, thickness and thermal annealing are varied in the process of titanium oxide films preparation. The effect of film porous structure thickness and the performance of the dye-sensitized solar cells is then observed.
In this study, XRD was used to detect the structure and crystallinity of films. FESEM was used to observe the film morphology. UV-Visible sperctrscopy was used to measure the light absorption in UV-Visible light range. Solar Simulator I-V measurement system was used to study the DSSC characteristics.
The experiment results reveal that that annealing at elevated temperature crystallinity of the TiO2 that can promote electron transfer in the photoanode. However, the resistance of ITO electrode increases as the annealing time increases, which result in poor collecting of photocurrent. So the relationship between thermal treatment and the resistance of ITO must reach a balance in order to achieve better optoelectronic transfer efficiency. Also by modifying film porous morphology and film thickness, we can increase the overall surface area of photoanode and the amount of dye absorption to promote the generation of photocurrent and improve DSSC efficiency. The highest efficiency obtained in this study is 6.1% when the substrate rotation speed is 0.17rpm with a thickness of 6μm.
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