Local Energy Landscape Drives Long-Range Exciton Diffusion in Two-Dimensional Halide Perovskite Semiconductors

Overview

Journal J Phys Chem Lett

Publisher American Chemical Society

Specialty Chemistry

Date 2021 Apr 20

PMID 33877840

Citations 4

Authors

Alan Baldwin

Geraud Delport

Kai Leng

Rosemonde Chahbazian

Krzysztof Galkowski

Kian Ping Loh

Samuel D Stranks

Affiliations

Soon will be listed here.

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 BAMAPbI 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.

Citing Articles

Boosting exciton mobility approaching Mott-Ioffe-Regel limit in Ruddlesden-Popper perovskites by anchoring the organic cation.

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Sub-angstrom noninvasive imaging of atomic arrangement in 2D hybrid perovskites.

Telychko M, Edalatmanesh S, Leng K, Abdelwahab I, Guo N, Zhang C Sci Adv. 2022; 8(17):eabj0395.

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Unlocking surface octahedral tilt in two-dimensional Ruddlesden-Popper perovskites.

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