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Improvement of Characteristics of Complementary Elactrochromic Devices by the Use of Various Transition-Metal-Oxide Films

使用各种过渡金属氧化物薄膜改善互补电致变色器件的特性

基本信息

批准号：
01550010
负责人：
YAMADA Shoji
金额：
$ 1.28万
依托单位：
Shizuoka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550010/
关键词：
Transition metal oxide Electrochromic phenomena Solid state electrolyte film Tungsten oxide film EC cell エレクトロクロミック特性光吸収スペクトル

项目摘要

Coloration efficiency and contrast of WO_3-based electrochromic (EC) cells are not enough for the application of display devices. This investigation aims to improve characteristics of EC devices by the combination of various transition-metal-oxide films, such as WO_3, WO_3/MoO_3, NiO and Ta_2O_5 films. Followings are the main results of this investigation.1. Preparation of WO_3, NiO and WO_3/MoO_3 filmsWO_3 films as cathodic EC films were prepared by rf sputtering. Examining the conditions for film preparation, coloration efficiency was improved about 20% compared with the conventional evaporated films. NiO films were prepared by rf sputtering, and were found to be anodic EC ones with high contrast. Mixed films of WO_3/MoO_3 were also prepared, whose coloration efficiency was high in viside wavelength range, and was about twice of WO_3 evaporated films.2. EC cells with liquid electrolyteEC characteristics were investigated with EC cells containing electrolyte of anodic, neutral and alkaline solutions. Construction of complementary EC cells was found to be difficult when both WO_3 and NiO films were used as EC materials.3. Measurements of characteristics of EC cellsOptical absorption spectra of colored films of WO_3 and NiO were measured. From the results, absorptance of complementary EC cell is expected to be wavelength independent in near-infrared and visible regions.4. Preparation of EC half cells with solid electrolyteSolid electrolyte layers were prepared by rf sputtering of Ta_2O_5 target, and were confirmed to be ionic conductors. EC cells composed of a solid electrolyte layer and an EC layer of WO_3 or NiO showed stable color-bleach characteristics.5. Preparation of all-solid-state complementary EC cellsComplementary EC cells consisting of WO_3/Ta_2O_5/NiO structure were prepared. The EC characteristics of the cells are now under investigation.

WO_3基电致变色（EC）电池的显色效率和对比度不足以满足显示器件的应用。本研究旨在通过各种过渡金属氧化物薄膜（如WO_3、WO_3/MoO_3、NiO和Ta_2O_5薄膜）的组合来改善EC器件的性能。本研究的主要结果如下：1. WO_3、NiO和WO_3/MoO_3薄膜的制备用射频溅射法制备了WO_3阴极电致变色薄膜。考察了薄膜制备条件，与常规蒸镀薄膜相比，着色效率提高了约20%。用射频溅射法制备了NiO薄膜，发现其为阳极EC膜，具有高对比度。制备了WO_3/MoO_3混合膜，在可见光范围内着色效率高，约为WO_3蒸镀膜的2倍.本文研究了含有阳极、中性和碱性电解质的EC电池的EC特性。发现WO_3和NiO膜同时用作电化学电池材料时，很难构建互补型电化学电池.测量了WO_3和NiO着色膜的吸收光谱。结果表明，互补型EC电池的吸收率在近红外和可见光区具有波长无关性.固体电解质EC半电池的制备用射频溅射Ta_2O_5靶制备固体电解质层，证实其为离子导体。由固体电解质层和WO_3或NiO EC层组成的EC电池具有稳定的褪色特性。5.制备了WO_3/Ta_2O_5/NiO结构的全固态互补式电致发光电池。细胞的EC特性正在研究中。