Year: 2025
Type: article
Abstract: Polar topological textures like the bubble domains, flux closures, labyrinths, etc., unlock functional responses in ferroic systems but are difficult to stabilize and control in chemically simple, solution-grown materials. Here, we show that ultra-thin, large-area CsPbBr3 nanoplatelets host room-temperature ferroelectric bubble domains whose characteristic size is tunable by thickness. Using contact resonance piezoresponse force microscopy across 125 nm–2 μm, we observe a systematic decrease in domain size with decreasing thickness, consistent with a depolarization field-controlled stability window. Repeated scanning transforms bubbles into labyrinthine patterns, indicating metastability under weak mechanical/electrical perturbations. Upon heating, bubbles evolve into labyrinths and vanish at Tc≈90 °C, with nucleation recovered on cooling. These results establish a controllable platform for polar topology in solvothermally grown stoichiometric perovskite, showing how thickness and temperature set boundary conditions that govern texture selection. The thickness-tunable polar textures identified here offer a route to engineer domain wall-mediated functionalities in halide perovskites.
Source: Applied Physics Letters
DOI: 10.1063/5.0301259
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4415933108