电致变色
制作
电致变色装置
材料科学
光电子学
纳米技术
化学
电极
物理化学
医学
病理
替代医学
作者
Jaehyun Bae,Dong Gyu Seo,Su Mi Park,Kyu Tae Park,Haekyoung Kim,Hong Chul Moon,Se Hyun Kim
标识
DOI:10.1088/1361-6463/aa8e88
摘要
We investigated the effect of process conditions on the electrochromic (EC) properties of tungsten trioxide (WO3) films. When WO3 films deposited using a sol-gel method were thermally treated in air at 150 °C, the majority of tungsten species in the films became W6+, which is important for the realization of an optically transparent bleached state. On the other hand, annealing in a vacuum required only 60 °C to induce a similar level of W6+ in the WO3 films. However, a cracked film morphology was observed at higher temperatures, regardless of whether the films were annealed in air or vacuum. Using the WO3 films prepared under various conditions, EC devices (ECDs) were fabricated to evaluate EC properties. We concluded that the optimal annealing conditions for WO3 films for ECDs are 60 °C in vacuum, at which the highest coloration efficiency, largest transmittance difference, and fastest bleaching/coloration dynamics were obtained. These mild fabrication conditions at a low temperature (60 °C) provide the opportunity to utilize flexible electrodes on plastic. Therefore, we successfully demonstrated a flexible WO3-based ECD.
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