TY  - JOUR
AU  - Shen, Zhou
AU  - Samoli, Margarita
AU  - Erdem, Onur
AU  - Bielecki, Johan
AU  - Samanta, Amit K.
AU  - E, Juncheng
AU  - Estillore, Armando D.
AU  - Kim, Chan
AU  - Kim, Yoonhee
AU  - Koliyadu, Jayanath
AU  - Letrun, Romain
AU  - Locardi, Federico
AU  - Lübke, Jannik
AU  - Mall, Abhishek
AU  - Monrroy Vilan e Melo, Diogo Filipe
AU  - Mills, Grant
AU  - Rafie-Zinedine, Safi
AU  - Round, Adam
AU  - Sato, Tokushi
AU  - de Wijn, Raphael
AU  - Wollweber, Tamme
AU  - Worbs, Lena
AU  - Zhuang, Yulong
AU  - Mancuso, Adrian P.
AU  - Bean, Richard
AU  - Chapman, Henry N.
AU  - Küpper, Jochen
AU  - Infante, Ivan
AU  - Lange, Holger
AU  - Hens, Zeger
AU  - Ayyer, Kartik
TI  - Direct Observation of the Exciton-Polaron in Single CsPbBr<sub>3</sub> Quantum Dots
JO  - ACS nano
VL  - 19
IS  - 31
SN  - 1936-0851
CY  - Washington, DC
PB  - Soc.
M1  - PUBDB-2025-03967
SP  - 28372 - 28382
PY  - 2025
AB  - The 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<sub>3</sub> 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<sub>3</sub> 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.
LB  - PUB:(DE-HGF)16
C6  - pmid:40751687
DO  - DOI:10.1021/acsnano.5c06716
UR  - https://bib-pubdb1.desy.de/record/638019
ER  -