期刊
ADVANCED SCIENCE
卷 10, 期 19, 页码 -出版社
WILEY
DOI: 10.1002/advs.202301064
关键词
broadband photopyroelectric effects; dielectric bistability; hybrid perovskites; improper ferroelectrics
The improper perovskite ferroelectric (IA)(2)(EA)(2)Pb3Cl10 with unusual dielectric bistability near 392 K is presented. It exhibits large pyroelectric figures-of-merit (FOMs) and covers a broad spectral range from ultraviolet to infrared-II.
The 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-T-c perovskite ferroelectric, (IA)(2)(EA)(2)Pb3Cl10 (1, where IA is isoamylammonium and EA is ethylammonium) is presented, in which spontaneous polarization (P-s) stems from the dynamic ordering of organic cations and the tilting of distorted PbCl6 octahedra. Notably, 1 displays unusual dielectric bistability with small variations in the temperature-dependent dielectric constants near T-c = 392 K; this bistable attribute endows large pyroelectric FOMs with peak voltage efficiency (F-V = 1.7x10(-2) cm(2) mu C-1) and sensitivity (F-D = 3.9x10(-4) Pa-1/2). These F-V and F-D parameters, beyond those of their proper counterparts, make 1 a promising candidate for infrared photodetection. As expected, the broadband photopyroelectric effects observed in 1 covered the ultraviolet to infrared-II spectral region (266-1950 nm). Such P-s-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.
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