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https://doi.org/10.1021/acs.jpclett.1c00823
Title: | Local Energy Landscape Drives Long-Range Exciton Diffusion in Two-Dimensional Halide Perovskite Semiconductors | Authors: | Baldwin, Alan Delport, Geraud Leng, Kai Chahbazian, Rosemonde Galkowski, Krzysztof Loh, Kian Ping Stranks, Samuel D. |
Issue Date: | 20-Apr-2021 | Publisher: | American Chemical Society | Citation: | Baldwin, Alan, Delport, Geraud, Leng, Kai, Chahbazian, Rosemonde, Galkowski, Krzysztof, Loh, Kian Ping, Stranks, Samuel D. (2021-04-20). Local Energy Landscape Drives Long-Range Exciton Diffusion in Two-Dimensional Halide Perovskite Semiconductors. Journal of Physical Chemistry Letters 12 (16) : 4003-4011. ScholarBank@NUS Repository. https://doi.org/10.1021/acs.jpclett.1c00823 | Rights: | Attribution 4.0 International | 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 BA2MAn-1PbnI3n+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. © 2021 The Authors. Published by American Chemical Society. | Source Title: | Journal of Physical Chemistry Letters | URI: | https://scholarbank.nus.edu.sg/handle/10635/233862 | ISSN: | 1948-7185 | DOI: | 10.1021/acs.jpclett.1c00823 | Rights: | Attribution 4.0 International |
Appears in Collections: | Staff Publications Elements |
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