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Microscopic origins of the surface exciton photoluminescence in ZnO nanostructures

Biswas, Mahua, Jung, Y.S., Kim, H.K., Kumar, K., Hughes, Greg orcid logoORCID: 0000-0003-1310-8961, Newcomb, Simon B., Henry, Martin O. and McGlynn, Enda orcid logoORCID: 0000-0002-3412-9035 (2012) Microscopic origins of the surface exciton photoluminescence in ZnO nanostructures. Proceedings of SPIE, 8263 . 82630W-82630W. ISSN 1996-756X

Abstract
Photoluminescence (PL) studies of the surface exciton peak in ZnO nanostructures at ∼3.367 eV are reported to elucidate the nature and origin of the emission and its relationship to nanostructure morphology. Localised voltage application in high vacuum and different gas atmospheres show a consistent PL variation (and recovery), allowing an association of the PL to a bound excitonic transition at the ZnO surface modified by an adsorbate. Studies of samples treated by plasma and of samples exposed to UV light under high vacuum conditions show no consistent effects on the surface exciton peak indicating no involvement of oxygen species. X-ray photoelectron spectroscopy data indicate involvement of adsorbed OH species. The relationship of the surface exciton peak to the nanostructure morphology is discussed in light of x-ray diffraction, scanning and transmission electron microscopy data.
Metadata
Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:Nanostructure; photoluminescence; surface exciton; adsorption
Subjects:Engineering > Materials
Physical Sciences > Spectrum analysis
Physical Sciences > Nanotechnology
Physical Sciences > Photonics
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:SPIE
Official URL:http://dx.doi.org/10.1117/12.913556
Copyright Information:© 2012 SPIE
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:19627
Deposited On:08 Nov 2013 11:16 by Enda Mcglynn . Last Modified 25 Oct 2018 15:37
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