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|Title:||Properties of electrochromic devices made with Nb2O5 and Nb2O5:X (X=Li,Ti or Mo) as coloring electrode|
Aegerter, Michel A.
|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|
|Date of registration:||3-Dec-2009|
|Faculty:||SE - Sonstige Einrichtungen|
|Department:||SE - INM Leibniz-Institut für Neue Materialien|
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