Surface effects on photoluminescence of single ZnO nanowires |
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| Authors: | Zhi-Min Liao Yang-Bo Zhou Jing-Min Zhang |
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| Affiliation: | a State Key Laboratory for Mesoscopic Physics and Electron Microscopy Laboratory, School of Physics, Peking University, Beijing 100871, PR China
b Department of Electronic Materials Engineering, Research School of Physical Sciences and Engineering, Australian National University, ACT 0200, Australia |
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| Abstract: | The influence of surface effects on the temperature dependent photoluminescence (PL) spectra from individual ZnO nanowires has been studied. It is found that the surface effects of the nanowire are very important in both ultraviolet (UV) and visible emission. We propose a new luminescence mechanism based on the recombination related to oxygen vacancies to explain the temperature dependent visible emission, which is significantly influenced by the carrier depletion and band bending caused by surface effects. In addition, the observed attenuation of UV emission with increasing temperature is ascribed to the decreasing depletion region and the increasing surface states related nonradiative recombination. |
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| Keywords: | 78.55.Et 78.67.-n |
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