Photoluminescence and cathodoluminescence studies of stoichiometric and oxygen-deficient ZnO films

Citation
Xl. Wu et al., Photoluminescence and cathodoluminescence studies of stoichiometric and oxygen-deficient ZnO films, APPL PHYS L, 78(16), 2001, pp. 2285-2287
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
APPLIED PHYSICS LETTERS
ISSN journal
0003-6951 → ACNP
Volume
78
Issue
16
Year of publication
2001
Pages
2285 - 2287
Database
ISI
SICI code
0003-6951(20010415)78:16<2285:PACSOS>2.0.ZU;2-4
Abstract
Photoluminescence and cathodoluminescence (CL) spectra of stoichiometric an d oxygen-deficient ZnO films grown on sapphire were examined. It was found that the intensities of the green and yellow emissions depend on the width of the free-carrier depletion region at the particle surface; the thinner t he width, the larger the intensity. Experimental results and spectral analy ses suggest that the mechanism responsible for the green (yellow) emission is the recombination of a delocalized electron close to the conduction band with a deeply trapped hole in the single ionized oxygen vacancy V-o(+) (th e single negatively charged interstitial oxygen ion O-i(-)) center in the p article. (C) 2001 American Institute of Physics.