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Proceedings Paper

Effective medium approximation of the optical properties of electrochromic cerium-titanium oxide compounds
Author(s): Nik von Rottkay; Terry J. Richardson; Michael Rubin; J. Slack; Enrico Masetti; G. Dautzenberg
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Paper Abstract

Cerium titanium oxide samples produced by sol-gel have been compared against sputtered and pulsed laser deposited films over a wide range of different compositions. X-ray diffraction was used to investigate the structural properties of the compound material existing in a two-phase mixture MAO2-MBO2. The optical properties were evaluated over the whole solar spectrum by variable angle spectroscopic ellipsometry combined with spectrophotometry. The spectral complex refractive index was determined for CeO2 and TiO2, as well as for their compounds. To reduce the large number of permutations in composition of multi-component oxides it would be useful to be able to predict the properties of the mixtures from the pure oxide components. Therefore these results were compared to those obtained by effective medium theory utilizing the optical constants of CeO2 and TiO2. In order to investigate the performance as passive counter-electrode in Li+ based electrochromic devices the films were tested by cyclic voltammetry with in-situ transmission control. Chemical composition was measured by Rutherford backscattering spectrometry. Surface morphology was analyzed by atomic force microscopy.

Paper Details

Date Published: 14 October 1997
PDF: 11 pages
Proc. SPIE 3138, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XV, (14 October 1997); doi: 10.1117/12.279205
Show Author Affiliations
Nik von Rottkay, Lawrence Berkeley National Lab. (United States)
Terry J. Richardson, Lawrence Berkeley National Lab. (United States)
Michael Rubin, Lawrence Berkeley National Lab. (United States)
J. Slack, Lawrence Berkeley National Lab. (United States)
Enrico Masetti, Ente per le Nuove Tecnologie, l'Energia, e l'Ambiente (Italy)
G. Dautzenberg, Univ. of Rome La Sapienza (Italy)


Published in SPIE Proceedings Vol. 3138:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XV
Carl M. Lampert; Claes G. Granqvist; Michael Graetzel; Satyen K. Deb, Editor(s)

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