Optical Properties of Lead-Free NKN Films from Transmission and Spectral Ellipsometry
authors Schwarz, R; Santos, L; Ayouchi, R; Bhattacharyya, SR; Mardolcar, U; Leal, M; Kholkin, A
nationality International
journal FERROELECTRICS
author keywords Band gap; optical transmission; spectral ellipsometry; NKN; thin film; PLD
keywords THIN-FILMS; NIOBATE; CERAMICS
abstract Thin films of lead-free NaxK1-xNbO3 (NKN) were prepared by pulsed laser deposition (PLD) from ceramic targets of stoichiometric NKN or doped with 6% of lithium niobate (LN). At a deposition temperature of 600 degrees C a strong dependence of film morphology on laser fluence is revealed by SEM microscopy. Optical properties like band gap and index of refraction were obtained through transmission measurements and analysis based on the Tauc model. The results were compared to spectral ellipsometry using a fit to the Tauc-Lorentz model, and slightly smaller band gap values were obtained. C-V characteristics of sandwich structures yielded high permittivity of 380 in pure NKN films and tunability at 1kHz of 3.2% at 1.5 MV/m applied electric field.
publisher TAYLOR & FRANCIS LTD
issn 0015-0193
year published 2013
volume 446
issue 1
beginning page 118
ending page 127
digital object identifier (doi) 10.1080/00150193.2013.821018
web of science category Materials Science, Multidisciplinary; Physics, Condensed Matter
subject category Materials Science; Physics
unique article identifier WOS:000324746300013
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journal impact factor 0.669
5 year journal impact factor 0.718
category normalized journal impact factor percentile 9.089
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