铁电性
材料科学
极化(电化学)
半导体
钙钛矿(结构)
分子工程
光电子学
纳米技术
化学工程
电介质
物理化学
化学
工程类
作者
Na Wang,Ning Ding,Ze‐Jiang Xu,Wang Luo,Hua‐Kai Li,Chao Shi,Heng‐Yun Ye,Shuai Dong,Le‐Ping Miao
出处
期刊:Small
[Wiley]
日期:2023-11-02
被引量:2
标识
DOI:10.1002/smll.202306502
摘要
Abstract Switchable spontaneous polarization is the vital property of ferroelectrics, which leads to other key physical properties such as piezoelectricity, pyroelectricity, and nonlinear optical effects, etc. Recently, organic–inorganic hybrid perovskites with 2D layered structure have become an emerging branch of ferroelectric materials. However, most of the 2D hybrid ferroelectrics own relatively low polarizations (<15 µC cm −2 ). Here, a strategy to enhance the polarization of these hybrid perovskites by using ortho ‐, meta ‐, para ‐halogen substitution is developed. Based on (benzylammonium) 2 PbCl 4 (BZACL), the para ‐chlorine substituted (4‐chlorobenzylammonium) 2 PbCl 4 (4‐CBZACL) ferroelectric semiconductor shows a large spontaneous polarization (23.3 µC cm −2 ), which is 79% larger than the polarization of BZACL. This large enhancement of polarization is successfully explained via ab initio calculations. The study provides a convenient and efficient strategy to promote the ferroelectric property in the hybrid perovskite family.
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