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http://hdl.handle.net/10397/91060
| 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 |
| Appears in Collections: | Journal/Magazine Article |
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|---|---|---|---|---|
| Leng_Local_energy_landscape.pdf | 3.33 MB | Adobe PDF | View/Open |
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