Publication date: 22nd July 2026
In this talk, I will present recent results and insights into the factors governing structure-property relationships in 3D bulk halide perovskites. A unifying theme is that these materials host dynamic, short-range octahedral tilt order, a local structure distinct from the average crystallographic phase that varies with the A-site cation and with thermal history.
I will first present Brillouin spectroscopy that reveals differences in the acoustic phonons of MA- and FA-based perovskites. We observe asymmetric Brillouin spectra, a signature of piezoelectric coupling between longitudinal acoustic (LA) phonons and the dynamic fluctuations of octahedral tilts. Complementary electric-field-dependent single crystal measurements show a corresponding contrast between the two cations, with a piezoelectric response present in MA but absent in FA, consistent with this coupling.
I will then introduce our 4D time-resolved hyperspectral photoluminescence imaging, which provides simultaneous temporal and spectral resolution at the diffraction limit. This allows us to identify charge transfer from the band edges to sub-gap states in thin CsPbBr3 single crystals in regions under tensile strain, providing a unified link between local structural fluctuations, nanoscale strain and macroscopic properties. Using the same technique, we follow the evolution of photoluminescence near phase transitions and find it to be strongly thermal-history dependent, revealing a further intrinsic instability. Together, these results establish local structural dynamics and thermal history as central, and potentially tunable, degrees of freedom in halide perovskites.
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