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Optical and electrochemical properties of cerium-zirconium mixed oxide thin films deposited by sol-gel and r.f. sputtering

TitoloOptical and electrochemical properties of cerium-zirconium mixed oxide thin films deposited by sol-gel and r.f. sputtering
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione1999
AutoriVarsano, F., Decker F., Masetti E., Cardellini F., and Licciulli A.
RivistaElectrochimica Acta
Volume44
Paginazione3149-3156
ISSN00134686
Parole chiaveCerium compounds, Crystal orientation, diffusion, Electrochemical properties, Electrochromic smart windows, Electrochromism, Electrodes, Heat treatment, Lithium, Lithium intercalation, Mixed oxide, Optical constants, Passive counter electrode, Radio frequency sputtering, Refractive index, Sol-gels, Sputtering, Thin films, Voltammograms, X ray diffraction analysis, Zirconia
Abstract

Films of Ce-Zr mixed oxide were produced by sol-gel and r.f. sputtering. These films can be used as 'passive' counter-electrodes in electrochromic smart windows because they retain their full transparency in both the oxidised and reduced state. Li intercalation was accomplished electrochemically using a liquid electrolyte. Electrochemical behaviour of the samples was found to be dependent on the heat treatment (sol-gel deposited film) and crystallite orientation (sputter deposited films). XRD analysis on sputter deposited films showed that the films are crystalline and grow following the orientation of the underlying tin doped indium oxide (ITO) film. Films of Ce-Zr mixed oxide lacking in (111) crystallite orientation show continuous evolution of the voltammograms and reach a maximum value for the cycled charge only after a large number of cycles. The lithium diffusion coefficient, calculated from GITT measurements, is in the range 10-12-10-14 cm2 s-1 for sputter deposited films and becomes as low as 10-15 cm2 s-1 for sol-gel deposited films. Optical constants of the thin films were calculated from reflectance and transmittance spectra. Refractive index values are in the range of 2.15-2.30 at λ = 633 mn depending on the deposition method. A sharp absorption edge at about 320 nm is seen in accordance with CeO2 optical properties.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-0032662980&doi=10.1016%2fS0013-4686%2899%2900032-8&partnerID=40&md5=ce18314e8bbf6730033541c6c5065216
DOI10.1016/S0013-4686(99)00032-8
Citation KeyVarsano19993149