Photo-induced macro/mesoscopic scale ion displacement in mixed-halide perovskites:ring structures and ionic plasma oscillations

作     者：Xiaoxiao Sun Yong Zhang Weikun Ge Xiaoxiao Sun;Yong Zhang;Weikun Ge

作者机构：Laboratory for Thin Films and PhotovoltaicsEmpa-Swiss Federal Laboratories for Materials Science and Technology8600 DuebendorfSwitzerland Department of Information Technology and Electrical EngineeringETH Zurich8093 ZurichSwitzerland Institute of Ion Beam Physics and Materials ResearchHelmholtz-Zentrum Dresden-RossendorfDresden 01328Germany Department of Electrical and Computer EngineeringThe University of North Carolina at CharlotteCharlotteNC 28223USA Department of PhysicsTsinghua UniversityBeijing 10084People's Republic of China 

出 版 物：《Light(Science & Applications)》 (光（科学与应用)（英文版）)

年 卷 期：2022年第11卷第10期

页      面：2388-2398页

核心收录：

学科分类：07[理学] 070204[理学-等离子体物理] 0702[理学-物理学] 

基　　金：Dr. Chee Fong Chai UNCC Eidgenössische Technische Hochschule Zürich, ETH, (19-2 EFL-55) Eidgenössische Technische Hochschule Zürich, ETH Helmholtz-Zentrum Dresden-Rossendorf, HZDR 

主　　题：mixed removing return 

摘      要：Contrary to the common belief that the light-induced halide ion segregation in a mixed halide alloy occurs within the illuminated area,we find that the Br ions released by light are expelled from the illuminated area,which generates a macro/mesoscopic size anion ring surrounding the illuminated area,exhibiting a photoluminescence *** intriguing phenomenon can be explained as resulting from two counter-balancing effects:the outward diffusion of the light-induced free Br ions and the Coulombic force between the anion deficit and surplus *** after removing the illumination,the macro/mesoscopic scale ion displacement results in a built-in voltage of about 0.4 V between the ring and the ***,the displaced anions return to the illuminated area,and the restoring force leads to a damped ultra-low-frequency oscillatory ion motion,with a period of about 20-30 h and lasting over 100 *** finding may be the first observation of an ionic plasma oscillation in *** understanding and controlling theion segregationdemonstrate that it is possible to turn this commonly viewedadverse phenomenoninto novel electronic applications,such as ionic patterning,self-destructive memory,and energy storage.