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Titel: Electrochromic properties of Nb2O5 sol-gel coatings
Verfasser: Avellaneda, César O.
Schmitt, Mike
Heusing, Sabine
Aegerter, Michel A.
Pawlicka, Agnieszka
Sprache: Englisch
Erscheinungsjahr: 1998
Quelle: Solar energy materials & solar cells. - 54. 1998, S. 9-17
SWD-Schlagwörter: Sol-Gel-Verfahren
Niob
Oxide
Tauchbeschichten
DDC-Sachgruppe: 500 Naturwissenschaften
Dokumentart : Journalartikel
Kurzfassung: 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 zu diesem Datensatz: urn:nbn:de:bsz:291-scidok-24505
hdl:20.500.11880/24273
http://dx.doi.org/10.22028/D291-24217
SciDok-Publikation: 19-Nov-2009
Fakultät: Sonstige Einrichtungen
Fachrichtung: SE - INM Leibniz-Institut für Neue Materialien
Fakultät / Institution:INM
SE - Sonstige Einrichtungen

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