Dynamic nanodomains in lead halide perovskites’
Milos Dubajic a
a Cavendish Laboratory, Department of Physics, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom
Proceedings of MATSUS Fall 2025 Conference (MATSUSFall25)
A4 Fundamental understanding of halide perovskite materials and devices - #PeroFun
València, Spain, 2025 October 20th - 24th
Organizers: Krishanu Dey, Iván Mora-Seró and Yana Vaynzof
Oral, Milos Dubajic, presentation 307
Publication date: 21st July 2025

Screening the Local Structural Space in Lead Halide Perovskites 
 
Milos Dubajic, Samuel D. Stranks
 
 
 
Recent investigations have revealed that halide perovskites are best described at equilibrium as containing short-lived (picosecond), nanoscale (a few unit cells) domains of lower symmetry than the bulk average structure, where the corner-sharing lead halide octahedra are tilted relative to each other. In this study, we employ Brillouin spectroscopy together with X-ray diffuse scattering to systematically screen the local structural space across various perovskite compositions. We demonstrate that, in selected compositions, finite polarization vector fields are generated in the vicinity of these nanodomains. Furthermore, by controlling the temperature, we modulate both the size and the dynamics of the nanodomains, a change that is directly observable as a softening of the elastic stiffness tensor upon cooling. Our precise determination of the symmetry and shape of these nanodomains across different average phases highlights the tunability achieved through A-site cation and halide anion substitutions. Given the strong correlation between these local structures and the macroscopic performance of these materials, our findings pave the way for the future tuning of optoelectronic properties in lead halide perovskite devices.

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