首页|Lead-free hybrid two-dimensional double perovskite with switchable dielectric phase transition

Lead-free hybrid two-dimensional double perovskite with switchable dielectric phase transition

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Molecular dielectric switches constitute a type of intelligent materials that are highly coveted for their distinctive advantages of switchable dielectric responses,lightweight,and mechanical flexibility.Two-dimensional(2D)hybrid perovskites have demonstrated excellent promise for assembling dielectric switches,in which the dynamic motions of organic moieties afford driving force to trigger switchable dielectric phase transition.Here,we successfully assembled a new lead-free hybrid double perovskite,(CHA)4CuBiBr8(1,CHA=cyclohexylammonium),adopting a typical 2D structural motif,which shows di-electric anisotropy and bistable behaviors during the reversible phase transition near Tc=378K(the Curie temperature).That is,its dielectric constants could be switched and tuned between high-dielectric and low-dielectric states.Structure analyses reveal that the ordered-disordered transformation of the organic CHA+moiety and distortion of inorganic framework account for its phase transition.This result will stim-ulate further exploration of molecular dielectric switches in this 2D environmentally friendly family.

Dielectric switchLead-freeDouble perovskitePhase transitionSymmetry breaking

Tian Yang、Yi Liu、Lina Hua、Yaoyao Chen、Wuqian Guo、Haojie Xu、Xi Zeng、Changhao Gao、Wenjing Li、Junhua Luo、Zhihua Sun

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College of Chemistry,Fuzhou University,Fuzhou 350108,China

State Key Laboratory of Structural Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China

National Natural science Foundation of ChinaNational Natural science Foundation of ChinaNational Natural science Foundation of ChinaNational Natural science Foundation of ChinaNational Natural science Foundation of ChinaNational Natural science Foundation of ChinaKey Research Program of Frontier Sciences of the Chinese Academy of SciencesNational Postdoctoral Program for Innovative TalentsNational Key Research and Development Program of ChinaChina Postdoctoral Science FundFujian Science & Technology Innovation Laboratory for Optoelectronic Information of China

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2024

10.1016/j.cclet.2023.108707

中国化学快报(英文版)
中国化学会

中国化学快报(英文版)

CSTPCD
影响因子：0.771
ISSN：1001-8417
年,卷(期)：2024.35(6)