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000638019 1001_ $$0P:(DE-H253)PIP1085061$$aShen, Zhou$$b0
000638019 245__ $$aDirect Observation of the Exciton-Polaron in Single CsPbBr$_3$ Quantum Dots
000638019 260__ $$aWashington, DC$$bSoc.$$c2025
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000638019 520__ $$aThe Outstanding optoelectronic properties of lead halide perovskites have been related to the formation of polarons. Nevertheless, the observation of the atomistic deformation brought about by one electron–hole pair in these materials has remained elusive. Here, we measure the transient structure of single CsPbBr$_3$ quantum dots (QDs) after resonant excitation in the single exciton limit using serial femtosecond crystallography (SFX). By reconstructing the three-dimensional (3D) differential diffraction pattern and building on density functional theory (DFT) calculations, we assign the lattice distortion after photoexcitation to the combined presence of a delocalized electron and a localized hole, forming a mixed large/small exciton-polaron. This result creates a clear picture of the polaronic deformation in CsPbBr$_3$ QDs and demonstrates the exceptional sensitivity of SFX to lattice distortions in few-nanometer crystallites. We plan to use this experimental platform for future studies of electron–lattice interactions. 
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