Please use this identifier to cite or link to this item: doi:10.22028/D291-24245
Title: Properties of electrochromic devices made with Nb2O5 and Nb2O5:X (X=Li,Ti or Mo) as coloring electrode
Author(s): Schmitt, Michael
Aegerter, Michel A.
Language: English
Year of Publication: 1999
OPUS Source: Switchable materials and flat panel displays : 21 - 22 July 1999, Denver, Colorado / Carl M. Lampert, chair/ed. - Bellingham, Wash. : SPIE, 1999. - (SPIE proceedings series ; 3788), S. 75-83
SWD key words: Elektrode
DDC notations: 620 Engineering and machine engineering
Publikation type: Conference Paper
Abstract: Electrochromic windows using Nb2O5, Nb2O5- Li2O, Nb2O5-TiO2 and Nb2O5-MoO3 sol-gel layers as cathodic coloring electrodes and CeO2- TiO2 as anodic ion-storage electrode have been assembled and tested. In agreement with a theoretical estimation, the switching behavior of these devices is strongly dependent on the difference between the internal potential of the electrochromic and the ion-storage electrodes. Only the configuration using a Nb2O5-MoO3 layer enters in consideration for long-time switching within the safe voltage range -2.5 V < V < +2.5 V. All other cells require larger negative potentials. The 8 X 4 cm2 devices built with Nb2O5:Mo are transparent with a slightly yellow color in the bleached state (+2.5 V) and dark gray in the colored state (-2.5 V). For a fixed thickness of the EC electrode (180 nm) the photopic transmittance increases with the thickness of the ion storage layer dIS in agreement with the model prediction. It reaches a maximum of ca. 0.3, corresponding to a Li+ intercalated charge density of 18 mC/cm2. For dIS is congruent to 950 nm, such devices are stable up to at least 12,000 cycles under potentiostatic cycling between +/- 2.5 V, 120 s.
Link to this record: urn:nbn:de:bsz:291-scidok-24891
ISBN: 0-8194-3274-1
Date of registration: 3-Dec-2009
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
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