У оквиру семинара Центра за физику чврстог стања и нове материјале Института за физику у Београду, у среду, 13. маја 2026. године у 12 часова у читаоници библиотеке „Др Драган Поповић“, у оквиру пројекта HIP-2D-QM, др Милош Дубајић (Катедра за хемијско инжењерство и биотехнологију, Универзитет у Кембриџу, Уједињено Краљевство) одржаће предавање:
Structural Heterogeneity in Lead Halide Perovskites across Spatial and Temporal Length Scales
САЖЕТАК:
Halide perovskites are a class of semiconductors that have rapidly emerged as one of the most promising materials for next-generation optoelectronic devices, including solar cells, light-emitting diodes, and photodetectors. Their unique combination of high efficiency, tunable bandgap, and low-cost solution processability has placed them at the forefront of materials research, yet the microscopic origin of their remarkable properties remains poorly understood.
In this talk, I will present our recent results and insights into the factors governing structure–property relationships in 3D bulk halide perovskites. We argue that the origin of their macroscopic properties lies in structural dynamics, in particular correlated octahedral tilts that give rise to fluctuating nanodomains. I will show how different chemical compositions at the A and X sites modify their local structure and affect these tilting correlations, and I will propose alternative strategies to control them.
I will also present our recently developed 4D time-resolved hyperspectral PL imaging, a technique that provides simultaneous temporal and spectral resolution at the diffraction limit. This allows us to identify charge transfer from band edges to sub-gap states in regions under tensile strain, providing a unified link between local structural fluctuations, nanoscale strain and macroscopic properties.