Improper High‐TcPerovskite Ferroelectric with Dielectric Bistability Enables Broadband Ultraviolet‐to‐Infrared Photopyroelectric Effects

Author:

Hua Lina1,Wang Jiaqi1,Liu Yi1,Guo Wuqian12,Ma Yu12,Xu Haojie12,Han Shiguo1,Luo Junhua123,Sun Zhihua123ORCID

Affiliation:

1. State Key Laboratory of Structure Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 P. R. China

2. University of Chinese Academy of Sciences Beijing 100049 P. R. China

3. Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou Fujian 350108 P. R. China

Abstract

AbstractThe photopyroelectric effect in ferroelectrics has shown great potential for application in infrared detection and imaging. One particular subclass is broadband with dielectric bistability, which allows for large pyroelectric figures‐of‐merit (FOMs). Herein, an improper high‐Tcperovskite ferroelectric, (IA)2(EA)2Pb3Cl10(1, where IA is isoamylammonium and EA is ethylammonium) is presented, in which spontaneous polarization (Ps) stems from the dynamic ordering of organic cations and the tilting of distorted PbCl6octahedra. Notably,1displays unusual dielectric bistability with small variations in the temperature‐dependent dielectric constants nearTc = 392 K; this bistable attribute endows large pyroelectric FOMs with peak voltage efficiency (FV = 1.7×10−2 cm2µC−1) and sensitivity (FD = 3.9×10−4Pa−1/2). TheseFVandFDparameters, beyond those of their proper counterparts, make1a promising candidate for infrared photodetection. As expected, the broadband photopyroelectric effects observed in1covered the ultraviolet to infrared‐II spectral region (266–1950 nm). SuchPs‐directed photoactivities overcome the optical bandgap limitation and allow for wide‐wave photodetection. As an innovative study on improper ferroelectricity, light is shaded here on the targeted engineering of new electrically ordered candidate materials for smart optoelectronic devices.

Funder

National Natural Science Foundation of China

Chinese Academy of Sciences

National Postdoctoral Program for Innovative Talents

National Key Research and Development Program of China

Publisher

Wiley

Subject

General Physics and Astronomy,General Engineering,Biochemistry, Genetics and Molecular Biology (miscellaneous),General Materials Science,General Chemical Engineering,Medicine (miscellaneous)

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