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Aufsatz zugänglich unter
Electrochromic properties of Nb2O5 sol-gel coatings
URN: urn:nbn:de:bsz:291-scidok-24505
URL: http://scidok.sulb.uni-saarland.de/volltexte/2009/2450/
Quelle:
(1998) Solar energy materials & solar cells. - 54. 1998, S. 9-17
pdf-Format:
Dokument 1.pdf (610 KB)
SWD-Schlagwörter:
Sol-Gel-Verfahren , Niob , Oxide , Tauchbeschichten
Institut:
INM Leibniz-Institut für Neue Materialien
DDC-Sachgruppe:
Naturwissenschaften
Dokumentart:
Aufsatz
Sprache:
Englisch
Erstellungsjahr:
1998
Publikationsdatum:
19.11.2009
Kurzfassung auf Englisch:
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.
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