WO3薄膜电致变色性能研究
文献类型：学位论文
| 作者 | 袁佳丽 |
| 文献子类 | 硕士 |
| 导师 | 邵建达 |
| 关键词 | 氧化钨，电致变色，倾斜沉积，性能退化，离子脱嵌 WO3, Electrochromic Properties, GLAD, Performance Degradation, Ion de-trapping |
| 其他题名 | Electrochromic Properties Optimization of WO3 Thin Films |
| 英文摘要 | 电致变色材料可以集成在电致变色器件中调制光学透射率，具有变色精确可控、记忆存储、无视觉盲角、响应速度快、变色稳定可逆、能耗极低等优点，通常应用于智能窗上，以创建低能耗与良好室内舒适度相结合的智能建筑，具有巨大的节能潜力。尽管电致变色器件已有较长研究历史，但仍有循环寿命短、响应时间过长和光强调制幅度小等缺点。因此，本文以最具应用潜力的电致变色材料氧化钨（WO3）为研究对象，利用倾斜沉积纳米制备技术和掺杂来改善提升WO3的电致变色性能，并研究了WO3薄膜在不同电解液中的衰退机制及其性能恢复。主要工作如下： 1）引入电子束蒸发倾斜沉积技术，实现可控倾斜纳米柱状结构的WO3电致变色薄膜制备，并适量掺杂TiO2材料。系统研究了70°沉积角制备的WO3薄膜电致变色性能，包括其透过率调制、响应时间、记忆效应和循环稳定性。在此基础上，探究了TiO2掺杂浓度对倾斜沉积WO3薄膜光学调制的影响，确定最合适的掺杂浓度以提升WO3电致变色性能。 2）系统地研究了WO3薄膜在酸性电解质中电致变色性能衰败现象及其原因。研究发现在低pH值的酸溶液电解质中进行电致变色循环后，非晶WO3薄膜电致变色性能发生快速衰败，并且生成纳米片状的新物质。通过对纳米片状物质进行物理性质表征，确定纳米片的成分、产生原因和机理。此外，对纳米片状薄膜电致变色性能进行表征，包括其响应速度和电荷存储能力。 3）研究有机电解质中WO3薄膜电致变色性能演化规律。研究结果表明电致变色性能退化主要来源于着色状态的衰退，恒电流模式可实现材料电致变色性能恢复。研究分析恒定电流去离子俘获对WO3薄膜电致变色性能的影响，结果表明不同大小的恒定电流均能实现薄膜光学调制性能恢复，甚至具有更大光学调制，但对其循环伏安曲线会造成不同的影响。; Electrochromic materials can be integrated in electrochromic devices to modulate the optical transmittance, with the advantages of controllable color change, memory storage, no visual blind angles, fast response, stable and reversible color changes, and extremely low energy consumption. The window smart that combine low energy consumption with good indoor comfort have enormous potential for energy savings. However, there are still several shortcomings of short cycle life, long response time, and small optical modulation. Therefore, in this thesis, tungsten oxide (WO3), the electrochromic material with the most potential for application, is studied. The glancing angle deposition (GLAD) technique and doping are used to improve the electrochromic properties of WO3. Besides, the decline electrochromic properties of WO3 film is recovered by different electrolytes. The main work is as follows: 1) Introduce electron beam glancing angle deposition technique to realize the preparation of WO3 electrochromic thin film with controllable tilted nanocolumn structure, and appropriate doping concentration of TiO2 material. The electrochromic properties of 70° tilt nanostructured films were studied systematically, including their transmittance modulation ?T, response time, memory effect and electrochromic cycle stability. Then, the effect of different TiO2 doping concentrations on the optical modulation of the obliquely deposited WO3 thin film was investigated, and the most suitable doping concentration was determined to improve the WO3 electrochromic performance. 2) Investigate the decay phenomenon and mechanism of acid electrolyte performance in WO3 electrochromic films. It was found that the electrochromic properties of the amorphous WO3 thin film were rapidly degraded after the electrochromic cycle in the acid solution electrolyte, and a new nanosheet material was generated. The nanosheets were characterized by electrochromic physical properties and a series of experiments to determine the composition, the causes, and the mechanism of the nanosheets. In addition, electrochromic performance of nanosheet, including response speed and charge storage capabilities, were characterized. 3) Study the electrochromic decay of the tungsten oxide film in the organic electrolyte and use the constant current mode to achieve the electrochromic performance recovery of the material. It was found that the decay of the electrochromic properties was mainly due to the deterioration of the coloring state, and the bleaching state remained unchanged. The effects of constant currents of Li+ ions on the electrochromic properties of WO3 thin films were studied. Constant currents can restore their optical modulation performance as early as possible, even with larger optical modulation ranges, but their CV curves will have different effects. |
| 学科主题 | 材料学 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/31095]  |
| 专题 | 中国科学院上海光学精密机械研究所 |
| 作者单位 | 中国科学院上海光学精密机械研究所 |
| 推荐引用方式 GB/T 7714 | 袁佳丽. WO3薄膜电致变色性能研究[D]. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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