1. Influence of metal organic chemical vapour deposition growth conditions on vibrational and luminescent properties of ZnO nanorods.
- Author
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Montenegro, D. N., Hortelano, V., Martínez, O., Martínez-Tomas, M. C., Sallet, V., Muñoz-Sanjosé, V., and Jiménez, J.
- Subjects
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METAL organic chemical vapor deposition , *CHEMICAL vapor deposition , *LUMINESCENCE , *NANORODS , *ZINC oxide - Abstract
A detailed optical characterization by means of micro Raman and cathodoluminescence spectroscopy of catalyst-free ZnO nanorods grown by atmospheric-metal organic chemical vapour deposition has been carried out. This characterization has allowed correlating the growth conditions, in particular the precursors partial-pressures and growth time, with the optical properties of nanorods. It has been shown that a high Zn supersaturation can favor the incorporation of nonradiative recombination centers, which can tentatively be associated with ZnI-related defects. Characterization of individual nanorods has evidenced that ZnI-related defects have a tendency to accumulate in the tip part of the nanorods, which present dark cathodoluminescence contrast with respect to the nanorods bottom. The effect of a ZnO buffer layer on the properties of the nanorods has been also investigated, showing that the buffer layer improves the luminescence efficiency of the ZnO nanorods, revealing a significant reduction of the concentration of nonradiative recombination centers. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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