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Title: Tracking carrier and exciton dynamics in mixed-cation lead mixed-halide perovskite thin films
Authors: Chang, Qing
Bao, Di
Chen, Bingbing
Hu, Hongwei
Chen, Xiaoxuan
Sun, Handong
Lam, Yeng Ming
Zhu, Jian-Xin
Zhao, Daming
Chia, Elbert E. M.
Keywords: Science::Physics
Issue Date: 2022
Source: Chang, Q., Bao, D., Chen, B., Hu, H., Chen, X., Sun, H., Lam, Y. M., Zhu, J., Zhao, D. & Chia, E. E. M. (2022). Tracking carrier and exciton dynamics in mixed-cation lead mixed-halide perovskite thin films. Communications Physics, 5(1), 1-9.
Project: MOE2019-T2-1-097 
Journal: Communications Physics
Abstract: Mixed-cation lead mixed-halide perovskites simultaneously possess structural stability and high power conversion efficiency. A thorough study of both carrier and exciton dynamics is needed to understand the photophysical properties that underpin its superior photovoltaic performance. By utilizing a broadband transient absorption spectroscopy, we observe the carrier and exciton dynamics in a FA0.85Cs0.15Pb(I0.97Br0.03)3 (FCPIB) perovskite by simultaneously resolving the carrier and exciton contribution to the transient change of the absorption spectra, from which the carrier density and exciton oscillator strength can be determined. Our data reveal a quick and significant conversion of the photogenerated carriers to excitons, on top of the usual carrier recombination process. Moreover, the decay of carrier density shows a change of kinetics from a second-order recombination at high pump fluence to a third-order recombination at low pump fluence. Our analysis utilizes band anharmonicity, presents an independent determination of electronic temperature and quasi-Fermi energy, and reveals an interesting interplay among the processes of carrier cooling, exciton formation/decay and carrier recombination, all as a function of time after photoexcitation. Our work demonstrates the use of pump fluence as a knob to tune the relative populations of carriers and excitons in halide perovskite materials.
ISSN: 2399-3650
DOI: 10.1038/s42005-022-00966-4
Schools: School of Physical and Mathematical Sciences 
School of Materials Science and Engineering 
Rights: © The Author(s) 2022. Open Access. 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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SPMS Journal Articles

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