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A deep understanding of the effect of the A‐site cation cross‐exchange on the hot‐carrier relaxation dynamics in perovskite quantum dots (PQDs) has profound implications on the further development of disruptive photovoltaic technologies. In this study, the hot carrier cooling kinetics of pure FAPbI3 (FA+, CH(NH2)2+), MAPbI3 (MA+, CH3NH3++), CsPbI3 (Cs+, Cesium) and alloyed FA0.5MA0.5PbI3, FA0.5Cs0.5...