Please use this identifier to cite or link to this item: doi:10.22028/D291-24592
Title: Development of electrochromic cells by the sol-gel process
Author(s): Munro, Brian
Conrad, Peter
Krämer, Stefanie
Schmidt, Helmut K.
Zapp, Patrick
Language: English
Year of Publication: 1998
OPUS Source: Solar energy materials & solar cells. - 54. 1998, S. 131-137
SWD key words: Sol-Gel-Verfahren
Substrat <Chemie>
DDC notations: 620 Engineering and machine engineering
Publikation type: Journal Article
Abstract: These investigations have the development of electrochromic cells via the sol-gel process as their objective. Syntheses routes for tungsten oxide, WO3, coating sols and cerium oxide-titanium oxide sols, CeO2-TiO2, were developed, which enabled indium-tin oxide (ITO) coated glass substrates to be coated homogeneously and without visible cracking. Optoelectrochemical measurements were employed to determine the variation of the electrochromic properties (change in optical density, &Delta;OD, and switching times) of WO3 layers, investigated as a function of coating parameters, such as chamber humidity and the temperature of heat treatment. A novel nanocomposite electrolyte system, based on organically modified silanes, was developed, which has an ionic conductivity of 10-4-10-5 S cm-1 at 25°C. Values of diffusion coefficients for lithium ions in tungsten oxide layers could be determined by electrochemical impedance spectroscopy (EIS) and lie in the range 10-11-10-12 cm2/s. The values obtained are comparable with literature values for WO3 layers deposited by sputtering. The cells which have been constructed to date show a typical reduction in transmission from 80% to 20% with a half-life of less than 30 s, where half-life is here defined as the time necessary for half of the change in transmission to be obtained, i.e. from 80% to 50%.
Link to this record: urn:nbn:de:bsz:291-scidok-29003
Date of registration: 18-Jun-2010
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
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