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Title: Indirect tail states formation by thermal-induced polar fluctuations in halide perovskites
Authors: Wu, Bo
Yuan, Haifeng
Xu, Qiang
Steele, Julian A.
Giovanni, David
Puech, Pascal
Fu, Jianhui
Ng, Yan Fong
Nur Fadilah Jamaludin
Solanki, Ankur
Mhaisalkar, Subodh
Mathews, Nripan
Roeffaers, Maarten B. J.
Grätzel, Michael
Hofkens, Johan
Sum, Tze Chien
Keywords: DRNTU::Science::Physics
Lasers, LEDs And Light Sources
Electronic Properties And Materials
Issue Date: 2019
Source: Wu, B., Yuan, H., Xu, Q., Steele, J. A., Giovanni, D., Puech, P., . . . Sum, T. C. (2019). Indirect tail states formation by thermal-induced polar fluctuations in halide perovskites. Nature Communications, 10(1), 484-. doi:10.1038/s41467-019-08326-7
Series/Report no.: Nature Communications
Abstract: Halide perovskites possess enormous potential for various optoelectronic applications. Presently, a clear understanding of the interplay between the lattice and electronic effects is still elusive. Specifically, the weakly absorbing tail states and dual emission from perovskites are not satisfactorily described by existing theories based on the Urbach tail and reabsorption effect. Herein, through temperature-dependent and time-resolved spectroscopy on metal halide perovskite single crystals with organic or inorganic A-site cations, we confirm the existence of indirect tail states below the direct transition edge to arise from a dynamical Rashba splitting effect, caused by the PbBr6 octahedral thermal polar distortions at elevated temperatures. This dynamic effect is distinct from the static Rashba splitting effect, caused by non-spherical A-site cations or surface induced lattice distortions. Our findings shed fresh perspectives on the electronic-lattice relations paramount for the design and optimization of emergent perovskites, revealing broad implications for light harvesting/photo-detection and light emission/lasing applications.
DOI: 10.1038/s41467-019-08326-7
DOI (Related Dataset):
Schools: School of Materials Science & Engineering 
School of Physical and Mathematical Sciences 
Research Centres: Energy Research Institute @ NTU (ERI@N) 
Rights: © 2019 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
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