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Title: Local energy landscape drives long-range exciton diffusion in two-dimensional Halide Perovskite semiconductors
Authors: Baldwin, A
Delport, G
Leng, K 
Chahbazian, R
Galkowski, K
Loh, KP
Stranks, SD
Issue Date: 2021
Source: Journal of physical chemistry letters, 2021, v. 12, no. 16, p. 4003-4011
Abstract: Halide perovskites are versatile semiconductors with applications including photovoltaics and light-emitting devices, having modular optoelectronic properties realizable through composition and dimensionality tuning. Layered Ruddlesden-Popper perovskites are particularly interesting due to their unique 2D character and charge carrier dynamics. However, long-range energy transport through exciton diffusion in these materials is not understood or realized. Here, local time-resolved luminescence mapping techniques are employed to visualize exciton transport in exfoliated flakes of the BA(2)MA(n-1)Pb(n)I(3n+1) perovskite family. Two distinct transport regimes are uncovered, depending on the temperature range. Above 100 K, diffusion is mediated by thermally activated hopping processes between localized states. At lower temperatures, a nonuniform energy landscape emerges in which transport is dominated by downhill energy transfer to lower-energy states, leading to long-range transport over hundreds of nanometers. Efficient, long-range, and switchable downhill transfer offers exciting possibilities for controlled directional long-range transport in these 2D materials for new applications.
Keywords: Excitons
Phonons
Diffusion
Energy
Perovskites
Publisher: American Chemical Society
Journal: Journal of physical chemistry letters 
EISSN: 1948-7185
DOI: 10.1021/acs.jpclett.1c00823
Rights: © 2021 The Authors. Published by American Chemical Society
This is an open access article under a Creative Commons Attribution 4.0 International License (CC BY 4.0) (https://creativecommons.org/licenses/by/4.0/)
The following publication Baldwin, Alan, Delport, Géraud, Leng, Kai, Chahbazian, Rosemonde, Galkowski, Krzysztof, Loh, Kian Ping, Stranks, Samuel D., Local Energy Landscape Drives Long-Range Exciton Diffusion in Two-Dimensional Halide Perovskite Semiconductors, 2021/04/29, The Journal of Physical Chemistry Letters, 12(16), 4003-4011 is available at https://doi.org/10.1021/acs.jpclett.1c00823
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