Spatial Distribution of Defect Luminescence in ZnO Nanorods: An Investigation by Spectral Cathodoluminescence Imaging

Zhu, L; Lockrey, M; Phillips, MR; Ton-That, C

Spatial Distribution of Defect Luminescence in ZnO Nanorods: An Investigation by Spectral Cathodoluminescence Imaging

Zhu, L Lockrey, M

Phillips, MR

Ton-That, C

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Publication Type:: Journal Article
Citation:: Physica Status Solidi (A) Applications and Materials Science, 2018, 215 (19)
Issue Date:: 2018-10-10

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Field	Value	Language
dc.contributor.author	Zhu, L	en_US
dc.contributor.author	Lockrey, M https://orcid.org/0000-0002-0050-2858	en_US
dc.contributor.author	Phillips, MR https://orcid.org/0000-0003-1522-9281	en_US
dc.contributor.author	Ton-That, C https://orcid.org/0000-0003-3276-1739	en_US
dc.date.available	2020-05-25T19:20:28Z
dc.date.issued	2018-10-10	en_US
dc.identifier.citation	Physica Status Solidi (A) Applications and Materials Science, 2018, 215 (19)	en_US
dc.identifier.issn	1862-6300	en_US
dc.identifier.uri	http://hdl.handle.net/10453/131318
dc.description.abstract	© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim The spatial distribution of ubiquitous green luminescence (GL) in ZnO nanorods is investigated using cathodoluminescence (CL) spectral imaging. The vertically aligned, single-crystal nanorods exhibit a strong GL emission at 2.42 eV at 80 K, attributable to oxygen vacancies. The spectral imaging reveals the GL emission is predominantly located in the surface layer of nanorods; the thickness and intensity of this layer decreases rapidly at elevated temperatures. On the other hand, the near-band-edge emission is weakest near the nanorod edges. The temperature-dependent CL maps are consistent with the properties of a model in which singly ionized oxygen vacancies are stabilized by the surface band bending, which leads to the GL enhancement at the expense of near-band-edge emission. These results demonstrate the utility of spectral CL imaging to map the spatial distribution of defect luminescence in nanostructured materials.	en_US
dc.relation	http://purl.org/au-research/grants/arc/DP150103317
dc.relation.ispartof	Physica Status Solidi (A) Applications and Materials Science	en_US
dc.relation.isbasedon	10.1002/pssa.201800389	en_US
dc.subject.classification	Applied Physics	en_US
dc.title	Spatial Distribution of Defect Luminescence in ZnO Nanorods: An Investigation by Spectral Cathodoluminescence Imaging	en_US
dc.type	Journal Article
utslib.citation.volume	19	en_US
utslib.citation.volume	215	en_US
utslib.for	0204 Condensed Matter Physics	en_US
utslib.for	0912 Materials Engineering	en_US
utslib.for	1007 Nanotechnology	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - CCET - Centre for Clean Energy Technology
utslib.copyright.status	open_access
pubs.issue	19	en_US
pubs.publication-status	Published	en_US
pubs.volume	215	en_US

Abstract:

© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim The spatial distribution of ubiquitous green luminescence (GL) in ZnO nanorods is investigated using cathodoluminescence (CL) spectral imaging. The vertically aligned, single-crystal nanorods exhibit a strong GL emission at 2.42 eV at 80 K, attributable to oxygen vacancies. The spectral imaging reveals the GL emission is predominantly located in the surface layer of nanorods; the thickness and intensity of this layer decreases rapidly at elevated temperatures. On the other hand, the near-band-edge emission is weakest near the nanorod edges. The temperature-dependent CL maps are consistent with the properties of a model in which singly ionized oxygen vacancies are stabilized by the surface band bending, which leads to the GL enhancement at the expense of near-band-edge emission. These results demonstrate the utility of spectral CL imaging to map the spatial distribution of defect luminescence in nanostructured materials.

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http://hdl.handle.net/10453/131318