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Luminescence with Local Distribution and Its Possible Mechanism in Zinc Oxide Micro-Crystallites |
| SHI Yuan-Yuan;TIAN Ke;LIN Bi-Xia;FU Zhu-Xi |
| Department of Physics, University of Science and Technology of China, Hefei 230026 |
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| Cite this article: |
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SHI Yuan-Yuan, TIAN Ke, LIN Bi-Xia et al 2007 Chin. Phys. Lett. 24 2398-2400 |
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Abstract The spatial luminescence distribution in the ZnO micro-crystallite films deposited on silicon substrates by CVD at room temperature is investigated by the cathedoluminescence (CL) image. It has been observed that the CL image of the samples constitutes a certain pattern. The UV emission pattern projective to the (0001) face of ZnO grains consists of a series of lines nearby the grain boundaries .The included angles between any two adjacent lines are almost 120°. What is more, some luminescent lines form a close hexagon similar to ZnOcrystalline structure. Such a local distribution property shows that the UV emission on as-grown ZnO crystallite should be due to some local
defects congregated to {1010} facets of ZnO grain rather than free exciton recombination.
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| Keywords:
78.68.+m
78.66.Hf
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Received: 12 April 2007
Published: 25 July 2007
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