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Ordered growth of tilted ZnO nanowires: morphological, structural and optical characterization

Zúñiga-Pérez, J and Rahm, A and Czekalla, C and Lenzner, J and Lorenz, M and Grundmann, M (2007) Ordered growth of tilted ZnO nanowires: morphological, structural and optical characterization. Nanotechnology, 18 (19). pp. 195303-195312. ISSN 09574484


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Tilted ZnO nanowires have been grown by high-pressure pulsed laser deposition (PLD) on m-plane sapphire without employing any catalyst species. The nanowires are inclined 30. with respect to the substrate normal and show well-defined epitaxial relationships with the m-plane sapphire substrate, the projection of the nanowiresf 0001 axis being parallel to the in-plane sapphire [P12P10] direction. Two sets of nanowires, differing in diameter and length, coexist within the initial growth stages, but only the narrowest and longest nanowires are found to keep on growing as deposition proceeds. A systematic study of the effects of growth conditions, including number of pulses, temperature, total pressure and oxygen partial pressure, has been carried out to determine those conditions under which a completely ordered array of tilted nanowires, with a minimum angular distribution, is obtained. Among the growth conditions, temperature and oxygen partial pressure are seen to mainly affect the nanowiresf axial and lateral growth rates, respectively, while the total chamber pressure allows monitoring of the evolution from thin film growth, at low pressure, to a mixture of nanowire/nanobelt growth, at high pressure. Finally, cathodoluminescence (CL) shows that low growth temperatures and high oxygen partial pressures improve the overall optical quality of the ZnO nanowire arrays.

Item Type:Article
Subjects:Material Science > Nanofabrication processes and tools
Analytical Science > Metrology and standards in nanotechnology
ID Code:188
Deposited By:Lesley Tobin
Deposited On:13 Nov 2008 16:02
Last Modified:31 Mar 2009 17:47

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