Spatially Resolved Observation of Ferroelectric-to-Paraelectric Phase Transition in a Two-Dimensional Halide Perovskite.

ABSTRACT: 2D halide perovskite ferroelectrics have garnered significant attention due to their potential applications and intriguing fundamental properties. However, their temperature-dependent ferroelectric behaviors, particularly at the nanoscale, remain poorly understood. In this study, the nanoscale ferroelectric domain evolution with temperature and ferroelectric-to-paraelectric phase transition in (BA)₂(MA)Pb₂Br₇ films are investigated using piezoresponse force microscopy (PFM). Angle-resolved lateral PFM (LPFM) reveals a complex in-plane ferroelectric domain structure. Temperature-dependent LPFM measurements clearly show that the Curie temperature (T_C) is ≈353 K, as confirmed by other macroscopic measurements. Notably, it is observed that the ferroe

SUBMITTER: Jung TH 

PROVIDER: S-EPMC12369678 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature