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Title: Electrochromic coloration efficiency of a-WO[sub 3[minus]y] thin films as a function of oxygen deficiency

Abstract

We report on how electrochromic coloration is affected by oxygen deficient stoichiometries in sputtered amorphous tungsten oxide (a-WO[sub 3[minus]y]) films. The electrochromic coloration efficiency increases with increasing oxygen deficiency in (a-WO[sub 3[minus]y]) films. No coloration is observed in nearly stoichiometric WO[sub 3] films. Raman spectroscopic studies reveal that the number of W[sup 5+] states generated with lithium insertion increases with the oxygen deficiency. Furthermore, there are no Raman peaks resulting from W[sup 5+] states in lithiated a-WO[sub 3[minus]y] films with near perfect stoichiometry, which is consistent with the absence of electrochromic coloration in those films. We conclude that the coloration efficiency of a-WO[sub 3[minus]y] films depends on the number of the W[sup 5+] states generated by lithium insertion and that the oxygen deficiency plays an important role in generating the W[sup 5+] states with lithium insertion. [copyright] [ital 1999 American Institute of Physics.]

Authors:
; ; ; ; ;  [1]
  1. (National Renewable Energy Laboratory, Golden, Colorado 80401 (United States))
Publication Date:
OSTI Identifier:
6194681
Alternate Identifier(s):
OSTI ID: 6194681
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 75:11; Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AMORPHOUS STATE; COLOR CENTERS; ELECTROCHROMISM; RAMAN SPECTRA; STOICHIOMETRY; THIN FILMS; TUNGSTEN COMPOUNDS; TUNGSTEN OXIDES; CHALCOGENIDES; CRYSTAL DEFECTS; CRYSTAL STRUCTURE; ELECTRO-OPTICAL EFFECTS; FILMS; OXIDES; OXYGEN COMPOUNDS; POINT DEFECTS; REFRACTORY METAL COMPOUNDS; SPECTRA; TRANSITION ELEMENT COMPOUNDS; VACANCIES 360204* -- Ceramics, Cermets, & Refractories-- Physical Properties

Citation Formats

Lee, S., Cheong, H.M., Tracy, C.E., Mascarenhas, A., Czanderna, A.W., and Deb, S.K. Electrochromic coloration efficiency of a-WO[sub 3[minus]y] thin films as a function of oxygen deficiency. United States: N. p., 1999. Web. doi:10.1063/1.124782.
Lee, S., Cheong, H.M., Tracy, C.E., Mascarenhas, A., Czanderna, A.W., & Deb, S.K. Electrochromic coloration efficiency of a-WO[sub 3[minus]y] thin films as a function of oxygen deficiency. United States. doi:10.1063/1.124782.
Lee, S., Cheong, H.M., Tracy, C.E., Mascarenhas, A., Czanderna, A.W., and Deb, S.K. Wed . "Electrochromic coloration efficiency of a-WO[sub 3[minus]y] thin films as a function of oxygen deficiency". United States. doi:10.1063/1.124782.
@article{osti_6194681,
title = {Electrochromic coloration efficiency of a-WO[sub 3[minus]y] thin films as a function of oxygen deficiency},
author = {Lee, S. and Cheong, H.M. and Tracy, C.E. and Mascarenhas, A. and Czanderna, A.W. and Deb, S.K.},
abstractNote = {We report on how electrochromic coloration is affected by oxygen deficient stoichiometries in sputtered amorphous tungsten oxide (a-WO[sub 3[minus]y]) films. The electrochromic coloration efficiency increases with increasing oxygen deficiency in (a-WO[sub 3[minus]y]) films. No coloration is observed in nearly stoichiometric WO[sub 3] films. Raman spectroscopic studies reveal that the number of W[sup 5+] states generated with lithium insertion increases with the oxygen deficiency. Furthermore, there are no Raman peaks resulting from W[sup 5+] states in lithiated a-WO[sub 3[minus]y] films with near perfect stoichiometry, which is consistent with the absence of electrochromic coloration in those films. We conclude that the coloration efficiency of a-WO[sub 3[minus]y] films depends on the number of the W[sup 5+] states generated by lithium insertion and that the oxygen deficiency plays an important role in generating the W[sup 5+] states with lithium insertion. [copyright] [ital 1999 American Institute of Physics.]},
doi = {10.1063/1.124782},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = ,
volume = 75:11,
place = {United States},
year = {1999},
month = {9}
}