Structure and Electrochromic Properties of Titanium-doped WO3 Thin Film by Sputtering

doi:10.15541/jim20160312

Abstract

Abstract:

Pure and Ti-doped WO₃ thin films prepared by RF (radio-frequency) magnetron at room temperature were determined by XRD, Raman and SEM to analyze the micro-structure and the morphology of the films. In addition, electrochemical workstation and UN-Vis-NIR spectrophotometer were used to measure their cycling stability and optical property. Research results showed that Ti doping had little interference with the surface morphology and optical constants, but the film crystallization temperature could be increased by Ti doping. Electrochemical test results showed that Ti doping could improve reversibility of ion injection and extraction, and improve cycling performance of films. Meanwhile, the switching speed and optical modulation performance of films were enhanced. In detail, the switching time of colored and bleached states were shortened from 9.8 s and 3.5 s to 8.4 s and 2.7 s, respectively. Therefore, Ti doped WO₃ thin films has better electrochromic properties.

Key words: electrochromic, titanium-doped, WO3 thin films, structure

CLC Number:

TQ174

PENG Ming-Dong, ZHANG Yu-Zhi, SONG Li-Xin, YIN Xiao-Fu, WANG Pan-Pan, WU Ling-Nan, HU Xing-Fang. Structure and Electrochromic Properties of Titanium-doped WO₃Thin Film by Sputtering[J]. Journal of Inorganic Materials, 2017, 32(3): 287-292.

Figures/Tables 8

Fig. 1 Stack model of the sample constructed for ellipsometry data analysis

Fig. 2 SEM images of pure WO3 (a) and Ti-doped WO3 thinfilms(b)

Fig. 3 XRD patterns of pure WO3 (a) and Ti-doped WO3 thin films (b) annealed at different temperatures

Fig. 4 Raman spectra of pure WO3 (a) and Ti-doped WO3 (b) thin films annealed at different temperatures

Fig. 5 Optical constant curves of pure WO3 and Ti-doped WO3 thin films^(a) Extinction coefficient; (b) Refraction index

Fig. 6 Cyclic voltammograms for pure WO3 (a) and Ti-doped WO3 thin films (b)

Fig. 7 Inserted and extracted charge density of pure WO3 and Ti-doped WO3 thin films during voltammetric cycling times

Fig. 8 Optical transmittance spectra of pure WO3 and Ti- doped WO3 thin films at different states

References 20

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Structure and Electrochromic Properties of Titanium-doped WO₃Thin Film by Sputtering

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