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Growth of isotopically enriched ZnO nanorods of excellent optical quality

Gray, Ciarán and Cullen, Joseph and Byrne, Conor and Hughes, Greg and Buyanova, Irina and Chen, Weimin and Henry, Martin O. and McGlynn, Enda (2015) Growth of isotopically enriched ZnO nanorods of excellent optical quality. Journal of Crystal Growth, 429 . pp. 6-12. ISSN 0022-0248

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Abstract

We have produced isotopically enriched ZnO nanorods using Zn-enriched ZnO source powder by vapour phase transport on silicon substrates buffer-coated with unenriched ZnO seed layers. SEM and XRD data confirm successful growth of high quality, dense, c-axis aligned nanorods over a substantial surface area. Raman data show a shift of >1 cm-1 in the peak position of the Raman scattered peaks due to the E2low and E2high phonon modes when the Zn isotope is changed from 64Zn to 68Zn, consistent with previous work, thus confirming successful isotopic enrichment. SIMS data provides additional confirmation of enrichment. The optical quality (as determined by photoluminescence feature intensity and linewidth) is excellent. Samples with Zn isotopic enrichment ranging from 64ZnO to 68ZnO display a shift in recombination energy of the bound excitons at the band edge (3.34 - 3.37 eV) of ~ 0.6 meV. This blue shift is also consistent with previously published data, further confirming both the excellent optical quality and successful isotopic substitution of ZnO nanorods using this relatively simple growth method.

Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:ZnO; Nanostructures; Isotopic enrichment; Photoluminescence
Subjects:Engineering > Materials
Physical Sciences > Spectrum analysis
Physical Sciences > Nanotechnology
Physical Sciences > Photonics
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.jcrysgro.2015.07.003
Copyright Information:© 2015 Elsevier
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:Irish Research Council for Science Engineering and Technology
ID Code:20765
Deposited On:01 Sep 2015 11:17 by Enda McGlynn. Last Modified 27 Apr 2017 12:48

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