Effective medium approximation of the optical properties of electrochromic cerium-titanium oxide compounds

Nik von Rottkay; Terry J. Richardson; Michael Rubin; J. Slack; Enrico Masetti; G. Dautzenberg

doi:10.1117/12.279205

14 October 1997 Effective medium approximation of the optical properties of electrochromic cerium-titanium oxide compounds

Nik von Rottkay, Terry J. Richardson, Michael Rubin, J. Slack, Enrico Masetti, G. Dautzenberg

Author Affiliations +

Proceedings Volume 3138, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XV; (1997) https://doi.org/10.1117/12.279205
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

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 M_AO₂-M_BO₂. 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.

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Nik von Rottkay, Terry J. Richardson, Michael Rubin, J. Slack, Enrico Masetti, and G. Dautzenberg "Effective medium approximation of the optical properties of electrochromic cerium-titanium oxide compounds", Proc. SPIE 3138, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XV, (14 October 1997); https://doi.org/10.1117/12.279205

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