Emergence of Ferroelectricity in Halide Perovskites

Abstract

Perovskite oxides such as PbZr x Ti 1-x O 3 (PZT) and BaTiO 3 show excellent dielectric, piezoelectric, pyroelectric and ferroelectric properties simultaneously and have been widely used in capacitor, sensor, actuator, motor, surface acoustic wave devices (SAW) and energy storage applications. Recently, a variety of solution-processed halide perovskite materials were discovered to exhibit fascinating properties such as high charge mobility, strong light absorption and even ferroelectricity. In this review, we summarize the recent progress on two classes of halide perovskite ferroelectrics. The first class is organo-lead halide perovskite semiconductor such as MAPbI 3 , which have been intensively pursued for solar cell and light emitting diode applications. Dynamic ferroelectric polarization is believed to be one of the This article is protected by copyright. All rights reserved. 2 essential factors to protect carriers from being scattered by charged defects in these halide perovskites. The second class is normal/multilayered halide perovskite ferroelectrics with large polarization or strong piezoelectricity. The piezoelectric coefficient of these latter perovskites can be as high as ~1540 pC N -1 , comparable to those of PZT-based ferroelectrics.Multiaxial polarizations and morphotropic phase boundaries (MPB) have also been demonstrated in such halide perovskites. Overall, the fast development of halide perovskite ferroelectrics opens a new venue for not only advancing fundamental materials science but also designing novel electronic and photoelectric devices.

Polar Structure and Two-Dimensional Heisenberg Antiferromagnetic Properties of Arylamine-Based Manganese Chloride Layered Organic–Inorganic Perovskites

“… 9 − 11 For example, a polar structure might lead to longer carrier lifetimes in photovoltaic materials, enhancing the separation and collection of charges. 10 Polar structures containing magnetic cations lead to the prospect of coexisting ferroelectric and magnetic order, which can potentially lead to improved electronic devices and data storage technology. 12 − 14 …”

Photoresponsive Piezoelectrics

“…However, due to their high leakage currents and structural Photo-Piezoelectrics instability especially when subject to strain, piezoelectric properties agreeing with the theoretical predictions have not been successfully measured in experiments, not to mention practical applications as could be expected for their oxide counterparts presented above. Readers can refer to literature (Kim et al, 2016;Eom et al, 2018;Jella et al, 2018Ippili et al, 2019;Shahrokhi et al, 2020) for potential applications (if any) incorporating the piezoelectricity of halide perovskites that could be realized in the future.…”

Influence of Fluorinated Components on Perovskite Solar Cells Performance and Stability

“…[ 44 ] Previously, it was certified that ferroelectric materials can reduce the recombination of light‐excited electron–hole pairs, further extend the carrier lifetime, and promote the charge separation and collection in PSCs. [ 45,46 ]…”