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We study the nature of photo-excited charge carriers in CsPbBr3 nanocrystalthin films by ultrafast optical pump - THz probe spectroscopy. We observe adeviation from a pure Drude dispersion of the THz dielectric response that isascribed to the polaronic nature of carriers; a transient blueshift of observedphonon frequencies is indicative of the coupling between photogenerated chargesand stretching-bending modes of the deformed inorganic sublattice, as confirmedby DFT calculations.

Ultrafast THz probe of photo-induced polarons in lead-halide perovskites