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 μ m, 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 T c ≈ 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.