Abstract A scalable photoelectrochromic (PEC) glass which can be darkened on exposure to sunlight and return to its original clear state in the absence of sunlight without any expensive materials like ruthenium dye or transparent conductive oxide was fabricated. The PEC glass is composed of light absorbing layer of ligand attached titanium oxide, color changing layer of tungsten oxide and the electrolyte containing redox mediator. This work reports, for the first time, on an application of salicylic acid attached TiO2 photoactive layer for PEC devices. The applicability of various salicylic acid derivatives attached TiO2 films in PEC device is individually investigated in dye solar cells. Among various salicylic acid derivatives studied, 5-methylsalicylic acid showed the best performance in terms of charge generation for coloration of WO3. By using 5-methylsalicylic acid instead of ruthenium dye, lower cost, higher stability, and simpler electrolyte composition have been realized. The changes in transmittance for coloration (ΔTC) depend on the thickness of WO3 and TiO2 in this device. Thus, we changed the thickness of WO3 and TiO2 to get the highest variation of transmittance for coloration. The preliminary optimization of PEC device exhibits ΔTC of 40.8% at 550 nm, the wavelength most sensitive to the human eye, and of 64.3% at 700 nm.

中文翻译：

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由配体附着的 TiO2 光敏层驱动的高性能可扩展光电致变色玻璃

摘要 制备了一种可伸缩的光电致变色 (PEC) 玻璃，它可以在暴露在阳光下时变暗，并在没有阳光的情况下恢复到其原始清晰状态，而无需使用任何昂贵的材料，如钌染料或透明导电氧化物。PEC玻璃由配体附着氧化钛的吸光层、氧化钨变色层和含有氧化还原介体的电解质组成。这项工作首次报告了水杨酸附着的 TiO2 光敏层在 PEC 器件中的应用。在染料太阳能电池中单独研究了附着在 PEC 器件中的各种水杨酸衍生物的 TiO2 薄膜的适用性。在研究的各种水杨酸衍生物中，5-甲基水杨酸在 WO3 着色的电荷生成方面表现出最佳性能。通过使用5-甲基水杨酸代替钌染料，实现了更低的成本、更高的稳定性和更简单的电解质组成。着色透射率的变化 (ΔTC) 取决于该器件中 WO3 和 TiO2 的厚度。因此，我们改变了 WO3 和 TiO2 的厚度以获得最高的着色透射率变化。PEC 器件的初步优化在 550 nm（对人眼最敏感的波长）处的 ΔTC 为 40.8%，在 700 nm 处为 64.3%。