Study of Zinc Oxide Nanotip Ultraviolet Photodetector
| Autor: | Jyun-jie Jhang, 張竣傑 |
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| Rok vydání: | 2010 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 98 In this study, we prepare the zinc oxide nanotip with aqueous solution on Al doped ZnO/glass substrate. In excess of 6 hours growth, the film-liked layer is obtained in the bottom of ZnO nanotip. In order to study the photoresponse of maximum ZnO nanotip length without film-like layer, we choose 6 hours as the growth time of ZnO nanotip, which the height is almost the same of about 4 μm. For the fabrication of ZnO nanotip UV photodetector, In-Zn was use as anode and cathode electrodes in digitate type on the top of ZnO nanotip array. The photoresponse which use AZO buffer layer of 300 s is better than others due to the larger surface to volume ratio. We obtain that Ron/off is 10.9, rise time is 280 s, and decay time is 870 s. The thermal annealing at 300 °C in N2, O2, and N2O for 1 hr can improve the photoresponse, because the Zn(OH)2 in the ZnO nanotip gets converted into ZnO. Among annealing ambiences, the annealed ZnO nanotip in N2O show higher performance due to high decomposition of O atoms, which fills in the oxygen vacancy. We obtained that Ron/off is 26.04, rise time is 50 s, and decay time is 70 s at 300 oC in N2O. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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