Publication date: 17th July 2025
The presentation will review some recent results on the effect of carrier-lattice coupling, exciton complexes and strong lattice anharmonicity on the optoelectronic properties of halide perovskites and their nanostructures. The early theoretical prediction and experimental demonstration of screening of electron-hole interactions by charge carrier-lattice coupling in 3D perovskites, was crucial to explain why photocarrier collection is possible at RT and how solar cell architectures could evolve toward much thicker active layers. The evaluation of carrier-lattice or exciton-lattices coupling remain challenging due to the complexity of the lattice fluctuations, including both deterministic and stochastic motions, covering a wide range of frequency. The interplay of these fluctuations with the electronic degrees of freedom is further complicated by the presence of Rashba effects, quantum and dielectric confinement. A fully predictive and accurate description of all the optoelectronic properties of halide perovskites is highly involved, because it underpins the physics of exciton complexes, hot carriers, polarons and excitonic polarons.
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