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Aufsatz zugänglich unter
URN: urn:nbn:de:bsz:291-scidok-24505

Electrochromic properties of Nb2O5 sol-gel coatings

Avellaneda, César O. ; Schmitt, Mike ; Heusing, Sabine ; Aegerter, Michel A. ; Pawlicka, Agnieszka

Quelle: (1998) Solar energy materials & solar cells. - 54. 1998, S. 9-17
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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.
Lizenz: Standard-Veröffentlichungsvertrag

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