Properties of electrochromic devices made with Nb2O5 and Nb2O5:X (X=Li, Ti, or Mo) as coloring electrode

Mike Schmitt; Michel Andre Aegerter

doi:10.1117/12.365774

8 October 1999 Properties of electrochromic devices made with Nb2O5 and Nb2O5:X (X=Li, Ti, or Mo) as coloring electrode

Mike Schmitt, Michel Andre Aegerter

Proceedings Volume 3788, Switchable Materials and Flat Panel Displays; (1999) https://doi.org/10.1117/12.365774
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

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 d_IS 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 d_IS 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.

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Mike Schmitt and Michel Andre Aegerter "Properties of electrochromic devices made with Nb2O5 and Nb2O5:X (X=Li, Ti, or Mo) as coloring electrode", Proc. SPIE 3788, Switchable Materials and Flat Panel Displays, (8 October 1999); https://doi.org/10.1117/12.365774

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