Simplified All‐Solid‐State WO3 Based Electrochromic Devices on Single Substrate: Toward Large Area, Low Voltage, High Contrast, and Fast Switching Dynamics,Advanced Materials Interfaces

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Simplified All‐Solid‐State WO3 Based Electrochromic Devices on Single Substrate: Toward Large Area, Low Voltage, High Contrast, and Fast Switching Dynamics
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2020-01-01 , DOI: 10.1002/admi.201901663
Pierluigi Cossari ₁ , Marco Pugliese _{1,

2} , Cataldo Simari ₃ , Alessio Mezzi ₄ , Vincenzo Maiorano ₁ , Isabella Nicotera ₃ , Giuseppe Gigli _{1,

2}

Affiliation

Electrochromic devices (ECDs) represent one of the most promising energy saving and solar control technology for the market of energy‐efficient building and optoelectronic devices. A continuous and intense effort is currently devoted to the development of effective solid‐state ECDs and their integration in multifunctional systems, such as photoelectrochromics. Here, the fabrication of simplified all‐solid‐state WO₃ based ECDs on single‐substrate is reported, demonstrating how the rational design of highly interconnected WO₃ columnar nanostructures with Nafion polymer matrix remarkably decreases the charge transport barrier at the hybrid electrolyte/electrochromic interface (EEI), thus determining an impressive improvement of overall device performances. The soft polymer substrate of the electrolyte plays a key role on the formation of WO₃ pillar‐like structures and on the increase of interfacial contact area by affecting the vacuum‐deposition WO₃ growth. Apart from providing higher transmittance in bleached state, the resulting device, entirely manufactured at room temperature by bottom‐up process, exhibits lower activation voltages (0.5–3 V) and faster switching kinetics (5–10 s) compared with monolithic ECDs based on both bulk and mesoporous WO₃ films. Furthermore, the enhanced EEI enables the scale‐up on large area and flexible substrate ensuring simultaneously a wide optical contrast (ΔT = 70%), and high coloration efficiency.

中文翻译：

在单个基板上简化的基于全固态WO3的电致变色器件：朝着大面积，低电压，高对比度和快速开关动力学的方向发展

电致变色设备（ECD）代表了节能建筑和光电设备市场上最有希望的节能和太阳能控制技术之一。当前，人们一直在持续不断地努力开发有效的固态ECD，并将其集成到诸如光电致变色等多功能系统中。在此，报告了在单个基板上制造基于简化的全固态WO ₃的ECD的过程，这说明了高度互连的WO ₃的合理设计是如何进行的。具有Nafion聚合物基质的圆柱状纳米结构显着降低了混合电解质/电致变色界面（EEI）处的电荷传输势垒，从而确定了整体器件性能的显着提高。电解质的软质聚合物基材通过影响真空沉积WO _3的生长，在WO ₃柱状结构的形成和界面接触面积的增加上起着关键作用。与基于漂白的单片ECD相比，除了在漂白状态下提供更高的透射率外，所得器件完全在室温下通过自下而上的工艺制造，具有较低的激活电压（0.5-3 V）和更快的开关动力学（5-10 s）。散装和中孔WO ₃电影。此外，增强的EEI可以在大面积和柔性基板上放大，同时确保宽的光学对比度（ΔT = 70％）和高着色效率。

更新日期：2020-01-01

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