Please use this identifier to cite or link to this item: doi:10.22028/D291-24217
Title: Electrochromic properties of Nb2O5 sol-gel coatings
Author(s): Avellaneda, César O.
Schmitt, Mike
Heusing, Sabine
Aegerter, Michel A.
Pawlicka, Agnieszka
Language: English
Year of Publication: 1998
OPUS Source: Solar energy materials & solar cells. - 54. 1998, S. 9-17
SWD key words: Sol-Gel-Verfahren
DDC notations: 500 Science
Publikation type: Journal Article
Abstract: Sol-gel niobium oxide coatings are promising electrochromic materials. The sols have been prepared by a sonocatalytic mixing of NbCl5 powder, butanol and acetic acid. Thermal analysis (DTA/TG) coupled to mass spectrometry has been performed on Nb2O5 precipitates to quantitatively analyse the effluents. Transparent and defect-free single and multilayers coatings have been deposited on ITO-coated glass by a dip-coating process and then calcined between 400 degrees C and 600 degrees C. The coatings structure change from amorphous to crystalline (TT form) and the later ones are highly textured. The films present a reversible and fast insertion/extraction kinetics for Li+ ions. After insertion the amorphous coatings present a grey-brown color, while the crystalline ones are dark blue. The maximum charge density exchanged with a three-layer 200 nm thick coating sintered at 600 degrees C was 16 mC/cm(2) with a corresponding spectral transmission change practically wavelength-independent varying from 80% to 20%. The coloring efficiency determined at lambda = 600 nm was 22 cm(2)/C.
Link to this record: urn:nbn:de:bsz:291-scidok-24505
Date of registration: 19-Nov-2009
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
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