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Coatings 2019, 9(3), 191; https://doi.org/10.3390/coatings9030191

Electrochromic Properties of Lithium-Doped Tungsten Oxide Prepared by Electron Beam Evaporation

1
Department of Electrical Engineering, National Sun Yat-sen University, Kaohsiung 804, Taiwan
2
Department of Electrical Engineering, Cheng Shiu University, Kaohsiung 833, Taiwan
*
Author to whom correspondence should be addressed.
Received: 24 December 2018 / Revised: 24 February 2019 / Accepted: 11 March 2019 / Published: 14 March 2019
(This article belongs to the Special Issue Electrochromic Thin Films and Devices)
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Abstract

In this study, xLi2O-(1−x)WO3 powders were mixed with WO3 and Li2O and pressed into target pellets to fabricate electrochromic films on indium tin oxide (ITO) glasses prepared by electron beam evaporation under the parameters of room temperature, and thicknesses of about 530 nm. It was expected that the amount of charge stored in the electrochromic devices (ECDs) could be enhanced by using the doping method in the cathode materials. The experimental results show that as the composition of Li0.18W0.82O2.6 powder was formed, the optimal characteristics of ECD can be obtained. In which, as a voltage of 3.5 V was applied on ECD, a transmittance change (ΔT%) of 53.1%, an optical density (ΔOD) of 0.502, an intercalation charge (Q) of 12.9 mC/cm2 and a coloration efficiency (η) of 41.6 cm2/C at a wavelength of 550 nm can be achieved. These results demonstrate that Li2O doping in WO3 films could effectively improve the coloration and electrochromic properties of ECD devices. View Full-Text
Keywords: tungsten trioxide; lithium oxide; electrochromic device; electron beam evaporation tungsten trioxide; lithium oxide; electrochromic device; electron beam evaporation
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Chang, J.-Y.; Chen, Y.-C.; Wang, C.-M.; Wang, W.-N.; Wen, C.-Y.; Lin, J.-M. Electrochromic Properties of Lithium-Doped Tungsten Oxide Prepared by Electron Beam Evaporation. Coatings 2019, 9, 191.

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