Journal
THIN SOLID FILMS
Volume 520, Issue 21, Pages 6510-6514Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2012.06.072
Keywords
Lithium niobate; Thin films; Sol-gel deposition; Optical bandgap; Transmission spectroscopy; Surface morphology; X-ray diffraction
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Lithium niobate (LN) thin films were deposited on quartz substrates by sol-gel technique. The measured absorption and photoluminescence spectra show that the band structure of LN thin films is direct unlike indirect band-gap in bulk LN and the optical band-gap of these LN thin films was measured to be 4.7 eV which is similar to 1 eV greater than that for stoichiometric bulk LN. The dependence of the blue shift of band-gap on several parameters like quantum confinement, composition (Li:Nb ratios of LN thin films) and strain was also investigated. The results obtained show that the large blue shift in band-gap of LN thin films is primarily due to strain in the film. (C) 2012 Elsevier B.V. All rights reserved.
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