Anisotropic Exciton Transport in a Lamellar CsPbBr<sub>3</sub> Nanocrystal Superlattice
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Anisotropic Exciton Transport in a Lamellar CsPbBr3 Nanocrystal Superlattice - main text and SI.pdf
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Author(s)
Sheehan, Thomas J.
Sekh, Taras V.
Bodnarchuk, Maryna I.
Kovalenko, Maksym V.
Tisdale, William A.
Date Issued
March 17, 2026
Journal
Nano Letters
Publisher
American Chemical Society
Citation
Anisotropic Exciton Transport in a Lamellar CsPbBr3 Nanocrystal Superlattice. Thomas J. Sheehan, Taras V. Sekh, Maryna I. Bodnarchuk, Maksym V. Kovalenko, and William A. Tisdale. Nano Letters 2026 26 (12), 4119-4125.
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Author's final manuscript
Abstract
Colloidal self-assembly is one strategy for engineering anisotropic properties into
otherwise isotropic materials. In this work, we demonstrate anisotropic exciton transport in an
A2B-type superlattice containing columns of 5.3 nm CsPbBr3 nanocubes assembled into a
hexagonal lattice around 6.5 nm LaF3 nanodisks. Using transient photoluminescence microscopy,
we determined that diffusivity along the fast axis of the superlattice is more than twice as large as
the slow axis at T = 5 K, but that anisotropy is greatly suppressed at room temperature. Calculations
of the diffusivity anisotropy ratio based on Förster theory overestimate the measured values,
highlighting the limitations of this theory in completely describing exciton transport. Overall, our
results demonstrate how self-assembly of colloidal nanocrystals can be used to engineer directional
energy transport, and raise more questions about the microscopic nature of dipole coupling in
CsPbBr3 NC superlattices.
MIT Department
Massachusetts Institute of Technology. Department of Chemical Engineering
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DOI of Published Version
10.1021/acs.nanolett.5c06369
