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Title: Optical indices of lithiated electrochromic oxides

Abstract

Optical indices have been determined for thin films of several electrochromic oxide materials. One of the most important materials in electrochromic devices, WO{sub 3}, was thoroughly characterized for a range of electrochromic states by sequential injection of Li ions. Another promising material, Li{sub 0.5}Ni{sub 0.5}O, was also studied in detail. Less detailed results are presented for three other common lithium-intercalating electrochromic electrode materials: V{sub 2}O{sub 5}, LiCoO{sub 2}, and CeO{sub 2}-TiO{sub 2}. The films were grown by sputtering, pulsed laser deposition (PLD) and sol-gel techniques. Measurements were made using a combination of variable-angle spectroscopy ellipsometry and spectroradiometry. The optical constants were then extracted using physical and spectral models appropriate to each material. Optical indices of the underlying transparent conductors, determined in separate studies, were fixed in the models of this work. The optical models frequently agree well with independent physical measurements of film structure, particularly surface roughness by atomic force microscopy. Inhomogeneity due to surface roughness, gradient composition, and phase separation are common in both the transparent conductors and electrochromics, resulting sometimes in particularly complex models for these materials. Complete sets of data are presented over the entire solar spectrum for a range of colored states. This data is suitablemore » for prediction of additional optical properties such as oblique transmittance and design of complete electrochromic devices.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Assistant Secretary for Energy Efficiency and Renewable Energy, Washington, DC (United States)
OSTI Identifier:
446411
Report Number(s):
LBNL-39410; CONF-9609325-2
ON: DE97003479; TRN: AHC29706%%117
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Conference
Resource Relation:
Conference: 15. SPIE international symposium on optical materials technology for energy efficiency and solar energy conversion, Freiburg (Germany), 16-19 Sep 1996; Other Information: PBD: Sep 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; OPTICAL PROPERTIES; TUNGSTEN OXIDES; NICKEL OXIDES; LITHIUM OXIDES; VANADIUM OXIDES; COBALT OXIDES; CERIUM OXIDES; TITANIUM OXIDES; ELECTROCHROMISM; CLATHRATES; SURFACE PROPERTIES

Citation Formats

Rubin, M, Rottkay, K von, Wen, S J, Ozer, N, and Slack, J. Optical indices of lithiated electrochromic oxides. United States: N. p., 1996. Web.
Rubin, M, Rottkay, K von, Wen, S J, Ozer, N, & Slack, J. Optical indices of lithiated electrochromic oxides. United States.
Rubin, M, Rottkay, K von, Wen, S J, Ozer, N, and Slack, J. 1996. "Optical indices of lithiated electrochromic oxides". United States. https://www.osti.gov/servlets/purl/446411.
@article{osti_446411,
title = {Optical indices of lithiated electrochromic oxides},
author = {Rubin, M and Rottkay, K von and Wen, S J and Ozer, N and Slack, J},
abstractNote = {Optical indices have been determined for thin films of several electrochromic oxide materials. One of the most important materials in electrochromic devices, WO{sub 3}, was thoroughly characterized for a range of electrochromic states by sequential injection of Li ions. Another promising material, Li{sub 0.5}Ni{sub 0.5}O, was also studied in detail. Less detailed results are presented for three other common lithium-intercalating electrochromic electrode materials: V{sub 2}O{sub 5}, LiCoO{sub 2}, and CeO{sub 2}-TiO{sub 2}. The films were grown by sputtering, pulsed laser deposition (PLD) and sol-gel techniques. Measurements were made using a combination of variable-angle spectroscopy ellipsometry and spectroradiometry. The optical constants were then extracted using physical and spectral models appropriate to each material. Optical indices of the underlying transparent conductors, determined in separate studies, were fixed in the models of this work. The optical models frequently agree well with independent physical measurements of film structure, particularly surface roughness by atomic force microscopy. Inhomogeneity due to surface roughness, gradient composition, and phase separation are common in both the transparent conductors and electrochromics, resulting sometimes in particularly complex models for these materials. Complete sets of data are presented over the entire solar spectrum for a range of colored states. This data is suitable for prediction of additional optical properties such as oblique transmittance and design of complete electrochromic devices.},
doi = {},
url = {https://www.osti.gov/biblio/446411}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Sep 01 00:00:00 EDT 1996},
month = {Sun Sep 01 00:00:00 EDT 1996}
}

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