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Microscopic origins of the surface exciton photoluminescence peak in ZnO nanostructures

Biswas, Mahua, Jung, Y.S., Kim, H.K., Kumarappan, Kumar, Hughes, Greg orcid logoORCID: 0000-0003-1310-8961, Newcomb, Simon B., Henry, Martin O. and McGlynn, Enda orcid logoORCID: 0000-0002-3412-9035 (2011) Microscopic origins of the surface exciton photoluminescence peak in ZnO nanostructures. Physical Review B (PRB), 83 (23). p. 235320. ISSN 1098-0121

We report photoluminescence (PL) studies of the surface exciton peak in ZnO nanostructures at ∼3.367 eV aimed at elucidation of the nature and origin of the emission and its relationship to the nanostructure morphology. PL spectra in conjunction with localized voltage application in high vacuum and different gas atmospheres show a consistent variation (and recovery), allowing an association of the PL to a bound excitonic transition at the ZnO surface, which is modified by an adsorbate. PL studies of samples treated by plasma and of samples exposed to UV light under high vacuum conditions, both well-known processes for desorption of surface adsorbed oxygen, show no consistent effects on the surface exciton peak indicating the lack of involvement of oxygen species. X-ray photoelectron spectroscopy data strongly suggest involvement of adsorbed OH species. X-ray diffraction, scanning, and transmission electronmicroscopy data are presented also, and the relationship of the surface exciton peak to the nanostructure morphology is discussed.
Item Type:Article (Published)
Subjects:Engineering > Materials
Physical Sciences > Spectrum analysis
Physical Sciences > Nanotechnology
Physical Sciences > Semiconductors
DCU Faculties and Centres:Research Institutes and Centres > National Centre for Plasma Science and Technology (NCPST)
DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Publisher:American Physical Society
Official URL:http://dx.doi.org/10.1103/PhysRevB.83.235320
Copyright Information:© 2001 APS
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:19662
Deposited On:20 Nov 2013 13:47 by Enda Mcglynn . Last Modified 25 Oct 2018 15:37

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