Highlight : "Controlling the nucleation and growth kinetics of lead halide perovskite quantum dots"

DOI  : https://www.science.org/doi/10.1126/science.abq3616
Contacts : jacky.even@insa-rennes.fr, claudine.katan@univ-rennes1.fr

Abstract :
Colloidal lead halide perovskite nanocrystals are of interest as photoluminescent quantum dots (QDs) whose properties depend on their size and shape. We report a room-temperature synthesis of monodisperse, isolable, spheroidal APbBr3 QDs (“A” indicates cesium, formamidinium, and methylammonium) that are size tunable from 3 to >13 nanometers. The kinetics of both nucleation and growth are temporally separated and substantially slowed down. QDs of all these compositions exhibit up to four excitonic transitions in their linear absorption spectra, and we demonstrate experimentally and theoretically that the size-dependent confinement energy for all transitions is independent of the A-site cation.
This study was performed in collaboration with ETHZ (Zurich, Switzerland), Empa-Swiss Federal Laboratories for Materials Science and Technology (Dübendorf, Switzerland), Institut des Sciences Chimiques de Rennes (UMR 6226, CNRS).
This work was financially supported by the European Union through the Horizon 2020 Research and Innovation Programme through the FET Open Research and Innovation Action (grant agreement no. 899141, project PoLLoC)