光学设计用于全固态电致变色器件的高溅射效率三明治结构电解质

Sandwich Structured Electrolyte of High Sputtering Efficiency for All-solid-state Electrochromic Devices by Optical Design

全固态电致变色器件以其光学对比度高、响应速度快以及良好的循环稳定性等特点而广泛应用于节能窗、屏幕显示、多功能储能设备等诸多领域。然而,传统的基于单层电解质体系的全固态电致变色器件常受限于光学透过率和溅射效率的不足。本工作利用反应直流磁控溅射技术成功制备了基于LiAlO_(x)/Ta_(2)O_(5)/LiAlO_(x)(ATA)三明治结构电解质的全固态电致变色器件。通过引入ATA三明治结构电解质,所制得的七层体系电致变色器件(ITO/NiO/LiAlO_(x)/Ta_(2)O_(5)/LiAlO_(x)/WO_(3)/ITO)兼具了优异的透光率和可观的溅射效率。该全固态电致变色器件取得了令人满意的着色效率(79.6 cm^(2)/C),更快的响应速度(着色时间1.9 s,褪色时间1.6 s)以及数百次循环的良好稳定性。此外,ATA三明治结构电解质充分利用了Ta2O5优异的离子传输速率和稳定性,并提供了足够的锂离子以满足快速变色切换的需求。因而,通过连续直流溅射制备的基于ATA三明治结构电解质的全固态电致变色器件有望为高性能电致变色器件的量产和实际应用提供重要的指导。

The all-solid-state electrochromic devices(ECDs)have been widely developed for energy-saving windows,screen displays,multi-functional energy storage devices due to their characteristics such as large optical contrast,fast switching speed and good cycle stability.However,traditional all-solid-state ECDs based on monolayer electrolyte system are often limited by ordinary optical transmittance and inadequate sputtering efficiency.Herein,the all-solidstate ECDs integrated with LiAlO_(x)/Ta_(2)O_(5)/LiAlO_(x)(ATA)sandwich structured electrolyte were successfully fabricated by reactive DC magnetron sputtering technique.By means of introduction of ATA sandwich structured electrolyte,the prepared ECDs with seven layer(ITO/NiO/LiAlO_(x)/Ta_(2)O_(5)/LiAlO_(x)/WO_(3)/ITO)was endowed with superfine optical transmittance and substantial sputtering efficiency simultaneously.The ATA-based ECDs realized satisfactory coloration efficiency of 79.6 cm^(2)/C,fast switching speed as short as 1.9 s for coloring and 1.6 s for bleaching,and excellent cycling stability over hundreds of cycles.Furthermore,ATA sandwich structured electrolyte makes full use of the excellent ionic conductivity and stability of Ta_(2)O_(5),as well as enough lithium ions to meet the demand for fast color switching.Hence,ATA-based all-solid-state ECDs by continuous DC sputtering is expected to provide effective guidance for the mass production and practical application of the high-performance ECDs.