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Abnormal blueshift of UV emission in single-crystalline ZnO nanowires |
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| Authors: | Dandan Wang Jinghai Yang Guozhong Xing Lili Yang Ming Gao Tom Wu |
| Affiliation: | a Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China b Graduate School of the Chinese Academy of Sciences, Beijing 100049, China c Institute of Condensed Matter Physics, Jilin Normal University, Siping 136000, China d Department of Physics, Jilin University, Changchun 130023, China e Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore |
| Abstract: | Single-crystalline ZnO nanowires (NWs) were synthesized by a facile vapor transport method. The good orientation and high crystal quality were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and high-resolution transmission electron microscope (HRTEM) measurements. Excitation-power-dependence photoluminescence spectra of ZnO NWs show that the UV emission displayed an evident blueshift with increasing excitation power and the corresponding energy shift might be as large as 10 meV. This anomalous phenomenon correlates to the band bending level caused by the surface built-in electric field due to the existence of substantial oxygen vacancies. By increasing the excitation power, the enhanced neutralization effect near the surface will reduce the built-in electric field and lead to a reduction of band bending which triggers the blueshift of the UV emission. |
| Keywords: | 78.55.Et 81.10.Bk 81.05.Dz |
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