Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.536
Publication date: 16th December 2024
Two-dimensional hybrid perovskites are a highly intriguing class of materials, composed of alternating inorganic and organic molecular layers. Their reduced dimensionality combined with weak dielectric screening leads to the formation of tightly bound excitons that efficiently absorb and emit radiation. A central questions for excitons in perovskites from the perspectives of both fundamental physics and applications is their mobility. In addition, the flexibility of the material design allows for the integration of a variety of functional compounds including chiral molecules to enable polarization control of the optical response. In this talk I will focus on the transport of optically detected excitons in 2D perovskites via transient, ultrafast microscopy, featuring different regimes of propagation featuring free and localized states. I will show how the exciton transport is directly monitored using optical means, how it depends on conditions favoring either free particle diffusion or hopping, as well as how non-equilibrium populations lead to intriguing time-dependent dynamics. Finally, exciton propagation in chiral 2D perovskites will be demonstrated and its key relationship to the disorder discussed.
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