Improper High-T_c Perovskite Ferroelectric with Dielectric Bistability Enables Broadband Ultraviolet-to-Infrared Photopyroelectric Effects.

ABSTRACT: 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 Pb₃ Cl₁₀ (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

SUBMITTER: Hua L 

PROVIDER: S-EPMC10323668 | biostudies-literature | 2023 Jul

REPOSITORIES: biostudies-literature