Halide perovskites exhibit an exceptional combination of properties, strong light absorption, long carrier diffusion lengths and defect tolerance, yet a unified physical picture remains elusive. Growing evidence suggests that the missing piece lies in their dynamic lattice: structure-property relationship that emerge from anharmonicity, local symmetry breaking, and coupled electron-phonon-defect dynamics across multiple length and time scales. This symposium will bring together theory, and experiment to establish how structural dynamics govern transport, stability, and optoelectronic performance in halide perovskites. We will highlight advances in machine-learning-assisted interatomic potentials and large-supercell simulations that capture finite-temperature fluctuations, polaron formation, ion migration pathways, and phonon-limited transport, enabling predictive understanding of key materials metrics such as carrier mobility, thermal conductivity, and non-radiative recombination. Ultrafast spectroscopies will be featured for resolving photoexcited carrier motion, hot-carrier cooling, polaron and exciton formation, and electron-phonon coupling on femtosecond-to-nanosecond timescales. In parallel, direct structural probes, including time-resolved X-ray/electron diffraction and scattering-based methods, will be emphasized for mapping lattice distortion, dynamic disorder and electron-phonon interactions. Ultimately, this symposium will provide a forum for the community to converge on a coherent framework for dynamic perovskites and to identify the next opportunities unlocked by their uniquely disordered crystal lattices. Specific Topics
- Ultrafast Optical Spectroscopy
- Halide Segregation
- Ultrafast X-ray and electron diffraction
- Molecular Dynamics
- Electron-phonon interaction
- Defects in halide perovskites
- Future Applications of Halide Perovskites
Prof. Aron Walsh holds the Chair in Materials Design at Imperial College London. He received his PhD in Chemistry from Trinity College Dublin and later worked at the National Renewable Energy Laboratory, University College London, and the University of Bath. His research combines technique development and applications at the interface between solid-state chemistry and physics. He was awarded the EU-40 prize from the Materials Research Society for his work on the theory of solar energy materials, and is an Associate Editor for the Journal of the American Chemical Society.