Abstract In this paper, the Co doped TiO2 film with satisfactory electrochromic performances was prepared by a sol-gel method. To study the Co-doped influence on the TiO2 film for the electrochromic performances, we respectively regulated the Co ion content to 0, 0.4, 0.8 and 1.2 at%. Due to the Co ions doped into the TiO2 film, the synthesized film led to the generation of the oxygen vacancies. From the results, when the optimal Co ion content is 0.8 at%, the improved switching time (the bleached time of 2.9 s and the colored time of 5.1 s) and the improved coloration efficiency (18.89 cm2/C) compared to the other samples are obtained. These results can be due to the enhanced Li+ diffusion coefficient and electric conductivity, which result in the increase of the electrochromic reaction activity and the reduction of the optical band gap in colored state to improve the transmittance modulation. Thus, the new film can be a competitive electrochromic material to enhance the performances of the electrochromic device.

中文翻译：

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Co离子含量波动下TiO2薄膜电致变色性能研究

摘要 本文采用溶胶-凝胶法制备了电致变色性能良好的Co掺杂TiO2薄膜。为了研究 Co 掺杂对 TiO2 膜对电致变色性能的影响，我们分别将 Co 离子含量调节为 0、0.4、0.8 和 1.2 at%。由于 Co 离子掺杂到 TiO2 薄膜中，合成薄膜导致了氧空位的产生。结果表明，当最佳 Co 离子含量为 0.8 at% 时，与其他样品相比，转换时间（漂白时间为 2.9 s，着色时间为 5.1 s）和着色效率（18.89 cm2/C）得到改善获得。这些结果可能是由于增强的 Li+ 扩散系数和电导率，这导致电致变色反应活性的增加和着色状态下光学带隙的减小以改善透射率调制。因此，新薄膜可以成为一种有竞争力的电致变色材料，以提高电致变色器件的性能。