Publication date: 17th July 2025
The presentation will review some recent results on the effect of carrier-lattice coupling and lattice matching on the optoelectronic properties of halide perovskites and their heterostructures and 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 presentation will introduce recent methodological developments for the description of electron-coupling in the high temperature regime where lattice fluctuations are dominated by slow structural relaxations and strong anharmonicity. For the low-temperature regime, the importance of excitonic polarons will be stressed and new empirical and semi-empirical approaches will be described to account for the complexity of the carrier-lattice coupling in halide perovskites. Finally, the concept of lattice-matching will be presented and its predictive power will be demonstrated through a few experimental examples related to 2D/3D and multilayered halide perovskite heterostructures.
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