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Origin of the 3.331 eV emission in ZnO nanorods: comparison of vapour phase transport and pulsed laser deposition grown nanorods

Inguva, Saikumar and Gray, Ciarán and McGlynn, Enda and Mosnier, Jean-Paul (2016) Origin of the 3.331 eV emission in ZnO nanorods: comparison of vapour phase transport and pulsed laser deposition grown nanorods. Journal of Luminescence, 175 . pp. 117-121. ISSN 0022-2313

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Abstract

In this work, we report the growth of vertically aligned ZnO nanorods with excellent optical quality by both catalyst free vapor phase transport (VPT) and catalyst free pulsed laser deposition (PLD). We compare the near band edge emission of such deposits, with a focus on the identification of the origin of the 3.331 eV emission feature. X-ray diffraction (XRD), scanning electron microscopy (SEM) and low-temperature (13 K) photoluminescence (PL) were used to characterise these nanorod deposits. XRD and SEM data reveal that both techniques lead to highly textured ZnO nanorod arrays with uniform c-axis orientation normal to the substrate surface. The VPT-grown nanorods are well separated and show smooth, facetted surfaces whereas the PLD-grown nanorods are more closely packed and display comparatively rougher surfaces. The optical quality of the samples obtained by both growth methods was very good and low-temperature PL spectra were dominated in both cases by a strong I6 bound exciton (BX) emission (3.36 eV), and also showed emission from the surface exciton and the free exciton. A comparatively weak visible emission was also observed in samples deposited by both techniques. The main difference between the PLD- and VPT-grown nanorod samples is the presence of the 3.331 eV emission in the former, and its complete absence in the latter (as well as in continuous PLD-grown seed layers) which is discussed in light of the differing surface morphologies mentioned above and which provides strong support for our previous assignment of the origin of this defect to structural defects in the inhomogeneous sub-surface region close to the rough nanorod surface.

Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:ZnO; Nanorods; 3.331 eV; PL
Subjects:Engineering > Materials
Physical Sciences > Spectrum analysis
Physical Sciences > Nanotechnology
Physical Sciences > Semiconductors
Physical Sciences > Crystallography
DCU Faculties and Centres:Research Initiatives and Centres > National Centre for Plasma Science and Technology (NCPST)
DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Publisher:Elsevier
Official URL:http://dx.doi.org/10.1016/j.jlumin.2016.02.027
Copyright Information:© 2016 Elsevier
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:21120
Deposited On:24 Mar 2016 11:39 by Enda McGlynn. Last Modified 18 Feb 2018 01:02

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