Reversible electrochromism in α-In_(2)Se_(3) through ferroelectric switching induced phase transition  

范德华层状铁电体α-In_(2)Se_(3)中相变调控的电致变色现象

作　　者：Zhongshen Luo Qingyuan Wang Runcang Feng Shun Wang Zhou Zhou Yiqi Hu Qiankun Li Qingyu Yan Zhijian Feng Yanfei Hou Tianhao Ying Yuyan Weng Liang Fang Lu You 罗中慎;王庆元;冯润苍;王顺;周洲;胡一奇;李乾坤;闫庆雨;冯志坚;侯艳妃;应天浩;翁雨燕;方亮;游陆

机构地区：[1]School of Physical Science and Technology,Jiangsu Key Laboratory of Frontier Material Physics and Devices,Soochow University,Suzhou 215006,China

出　　处：《Science China Materials》2025年第3期906-911,共6页中国科学(材料科学)(英文版)

基　　金：the National Natural Science Foundation of China(12074278);the Priority Academic Program Development(PAPD)of Jiangsu Higher Education Institutions;the support from Suzhou Science and Technology Bureau(ZXL2022514).

摘　　要：Electrochromic materials change color or opacity when subjected to electrical stimuli,often through reversible chemical reactions or phase transitions.Their optical switch capabilities make them promising for applications like smart windows and glasses,thus garnering widespread attention in recent years.Van der Waals layered ferroelectric α-In_(2)Se_(3),known for its rich polymorphs,is a promising candidate for exploring physical property modulation via phase transformations.However,the discovery of electrochromism in In_(2)Se_(3) has been impeded by similar optical constants among its polymorphs.Herein,we report the experimental observation of reversible electrochromism in α-In_(2)Se_(3) thin flakes accompanied by ferroelectric polarization switching.Microscopic structural characterizations reveal that the color change stems from a crystalline-to-amorphous phase transition.An improved Kramer-Kronig analysis was employed to quantify the change in optical constants of the flake.A disordered polarization switching model,inherent to the crystal symmetry of α-In_(2)Se_(3),was proposed to explain the electrically driven amorphization.This work delivers distinct insight into the unique electrochromic behavior and unveils opportunities of relevant applications for the van der Waals layered ferroelectric.电致变色材料在受到电刺激时通常会通过可逆的化学反应或相变实现颜色或不透明度的改变.其光开关功能,使其在智能窗户和智能眼镜等领域显示出广阔的应用前景,近年来引起了广泛关注.范德华层状铁电材料α-In_(2)Se_(3)拥有丰富的同质异形体,因而是通过相变调控物理性质的理想候选材料.然而,由于其不同相之间的光学常数相似,α-In_(2)Se_(3)中电致变色现象的发现一直未被报道.在此,我们报道了实验中观察到的α-In_(2)Se_(3)伴随着铁电极化反转的可逆电致变色现象.通过多种微观结构的关联性表征,我们发现颜色变化源于从晶态到非晶态的相变.我们采用改进的Kramers-Kronig分析方法量化了薄片光学常数的变化,并提出了一种源于α-In_(2)Se_(3)晶体对称性的无序极化翻转模型来解释电驱动的非晶化现象.本研究提供了对独特电致变色行为的深刻理解,并揭示了范德华层状铁电体在相关应用中的潜力.

关 键 词：ELECTROCHROMISM ferroelectric switching phase transition optical constants 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]