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Title: Direct and indirect exciton transitions in two-dimensional lead halide perovskite semiconductors
Authors: Do, Thi Thu Ha
Granados Del Águila, Andrés
Xing, Jun
Liu, Sheng
Xiong, Qihua
Keywords: Science::Physics
Issue Date: 2020
Source: Do, T. T. H., Granados Del Águila, A., Xing, J., Liu, S., & Xiong, Q. (2020). Direct and indirect exciton transitions in two-dimensional lead halide perovskite semiconductors. Journal of Chemical Physics, 153(6), 064705-. doi:10.1063/5.0012307
Project: NRF-NRFI2015-03
Journal: Journal of Chemical Physics
Abstract: Atomically thin layers of two-dimensional lead halide perovskite semiconductors exhibit prominent light emission due to the inherently strong quantum and dielectric confinement. Electronic band structures and coupled electron-hole pairs (excitons), which govern the optical properties, are not well understood in these emergent two-dimensional materials. Here, we have performed both the steady-state and time-resolved photoluminescence spectroscopies with varying temperature to study the optical responses of a high-quality (PEA)2PbI4 single crystal. We observe a multitude of exciton transitions with different responses to temperature that suggests their different origins. Furthermore, our results suggest that the photoluminescence of layered perovskites is dominated by direct exciton transitions at low temperatures, while by an indirect exciton at high temperatures that can be explained by our proposed exciton band structure incorporating the interplay of Coulomb and Rashba effects. Our study sheds light on the intrinsic optical properties of two-dimensional perovskites that may be beneficial for the novel applications of perovskite-based devices.
ISSN: 0021-9606
DOI: 10.1063/5.0012307
Rights: © 2020 The Author(s). All rights reserved. This paper was published by AIP Publishing in Journal of Chemical Physics and is made available with permission of The Author(s).
Fulltext Permission: embargo_20210818
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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