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DOI	10.1063/5.0012307
	Direct and indirect exciton transitions in two-dimensional lead halide perovskite semiconductors
	Do T.T.H.; Granados Del Águila A.; Xing J.; Liu S.; Xiong Q.
发表日期	2020
ISSN	219606
卷号	153 期号:6
英文摘要	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. © 2020 Author(s).
scopus关键词	Band structure; Lead compounds; Optical properties; Perovskite; Photoluminescence; Photoluminescence spectroscopy; Single crystals; Dielectric confinement; Electron hole pairs; Electronic band structure; Exciton transitions; Intrinsic optical properties; Time resolved photoluminescence spectroscopies; Two-dimensional materials; Varying temperature; Excitons
来源期刊	Journal of Chemical Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/176842
作者单位	Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore; Key Laboratory of Eco-Chemical Engineering, Ministry of Education, Qingdao University of Science and Technology, Qingdao, 266042, China; MajuLab, International Joint Research Unit, UMI 3654, CNRS, Université Côte d'Azur, Sorbonne Université, National University of Singapore, Nanyang Technological University, Singapore, Singapore; State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing, China
推荐引用方式 GB/T 7714	Do T.T.H.,Granados Del Águila A.,Xing J.,et al. Direct and indirect exciton transitions in two-dimensional lead halide perovskite semiconductors[J],2020,153(6).
APA	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).
MLA	Do T.T.H.,et al."Direct and indirect exciton transitions in two-dimensional lead halide perovskite semiconductors".Journal of Chemical Physics 153.6(2020).