Laser-induced phase segregation of inorganic halide perovskite alloy nanowires for optical switch  

作　　者：Qihang Lv Xia Shen Xuyang Li Jianzhe Liu Zhaohui Shan Liantuan Xiao Pengfei Guo Johnny CHo 

机构地区：[1]College of Physics and Optoelectronics,Taiyuan University of Technology,Taiyuan 030024,China [2]Huangshan Bright Semiconductor Co.,Ltd.,Huangshan 245021,China [3]Department of Materials Science and Engineering,City University of Hong Kong,Kowloon,Hong Kong 999077,China [4]Institute for Materials Chemistry and Engineering,Kyushu University,Fukuoka 819-0395,Japan

出　　处：《Nano Research》2025年第2期878-886,共9页纳米研究(英文版)

基　　金：The authors are grateful to the National Natural Science Foundation of China(No.52373246);the Fundamental Research Program of Shanxi Provinces(No.20210302123128);the National Key Research and Development Program of China(No.2022YFA1404201)for financial support.

摘　　要：Inorganic perovskitenanostructures have attracted considerable attention for their tunable band gaps and excellent optoelectronic properties.It is inevitable that phase segregation of halide perovskite usually occurs in mixed-halide perovskites under a focused laser llumination,which caused by photo-induced halide-ion segregation.Here,we reported an uniform perovskite alloy nanowires via a chemical vapor deposition(CvD)method.Microstructural characterization reveals that these perovskite nanowires have independent linear morphology_with high-quality crystalline.Micro-photoluminescence(PL)spectra exhibit that these nanowire structures show a dual-wavelength emissions at 690 and 570 nm,respectively.Additionally,time-dependent PL intensity of the emission peak at 690 nm increased by the decrease of the emission peak at 570 nm under a focused laser llumination,indicating the formation of phase segregation at the excited positions.Moreover,based on these as-grown halide perovskite CsPbBr2.52lo.48 nanowires,a reasonably optical switch is designed and constructed.This optical switch may have potential applications in timed blasting system and time-delay circuit in the future.

关 键 词：perovskite alloy nanowires phase segregation dual-wavelength emission optical switch NANOPHOTONICS 

分 类 号：TN24[电子电信—物理电子学]