Research Progress on Ultrafast Dynamics of Hot Carriers in Halide Perovskites: A Review

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Chinese explanation / 中文解读

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Original abstract

Halide perovskites are promising for solar cells, photodetectors, and other optoelectronic devices due to their optoelectronic properties. Hot-carrier relaxation critically governs energy conversion efficiency. While slow hot-carrier cooling was traditionally ascribed to hot and quantum phonon bottlenecks, recent ultrafast spectroscopy studies challenge this view. This review synthesizes new experimental insights into hot-carrier relaxation in perovskite nanocrystals and two-dimensional (2D) perovskites, focusing on three key aspects: (1) Auger processes that bypass the phonon bottleneck; (2) A-site cation-dependent cooling rates (e.g., CsPbBr₃, MAPbBr₃, and FAPbBr₃), reflecting varying carrier-phonon coupling; and (3) slower surface vs. faster bulk cooling in 2D perovskites. Notably, conventional transient absorption may overestimate hot-carrier cooling times; state-resolved and time-resolved photoluminescence reveal sub-picosecond cooling in weakly confined nanocrystals. This paper clarify characterization methods, underlying mechanisms, and control strategies; highlight unresolved debates; and outlines future research directions.

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