摘要
本文采用真空热蒸发法,在ITO基底上制备WO_3薄膜,之后在空气气氛中对其进行了400℃,1 h的退火处理。SEM测试结果表明,退火后的WO_3薄膜变得更为致密平整。将退火后的WO_3薄膜,及通过溶胶凝胶法制得的TiO_2-CeO_2对电极薄膜和PC-PEO-LiClO_4凝胶态电解质封装得到电致变色器件,以探索该退火处理对WO_3薄膜电致变色性能的影响。结果表明,该WO_3基电致变色器件在632. 8 nm处的光学调制幅度达56. 8%,记忆时间超过24 h,且具有良好的循环稳定性。本研究表明WO_3薄膜的后期退火处理对制备高性能WO_3基电致变色器件具有重要的意义。
WO_3 thin films were prepared onto ITO glass substrates by thermal evaporation and then were annealed in air ambient at 400 ℃ for 1 h. The SEM results show that those annealed WO_3 thin films got more compact and smoother. The electrochromic devices were obtained by packaging the annealed WO_3 thin films with TiO_2-CeO_2 counter electrode fabricated with sol-gel method and Li ClO_4 gel electrolyte in PC-PEO. Effects of the annealing treatment on the electrochromic properties of WO_3 films were studied.It turned out that the optical modulation of the fabricated electochromic device was 56. 8% at wavelength of 632. 8 nm,and its memory duration was longer than 24 h,with good cyclic stability. This study suggests that the post annealing treatment of WO_3 films might be an effective way to improve the performances of WO_3 based electrochromic devices.
引文
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