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Title: Strain propagation in layered two-dimensional halide perovskites
Authors: Fu, Jianhui
Xu, Qiang
Ibrahim Abdelwahab
Cai, Rui
Febriansyah, Benny
Yin, Tingting
Loh, Kian Ping
Mathews, Nripan
Sun, Handong
Sum, Tze Chien
Keywords: Science::Physics
Issue Date: 2022
Source: Fu, J., Xu, Q., Ibrahim Abdelwahab, Cai, R., Febriansyah, B., Yin, T., Loh, K. P., Mathews, N., Sun, H. & Sum, T. C. (2022). Strain propagation in layered two-dimensional halide perovskites. Science Advances, 8(37), eabq1971-.
Project: MOE2019-T2-1-006 
Journal: Science Advances 
Abstract: Impulsive light excitation presents a powerful tool for investigating the interdependent structural and electronic responses in layered two-dimensional (2D) halide perovskites. However, detailed understanding of the nonlinear lattice dynamics in these soft hybrid materials remains limited. Here, we explicate the intrinsic strain propagation mechanisms in 2D perovskite single crystals using transient reflection spectroscopy. Ultrafast photoexcitation leads to the generation of strain pulses via thermoelastic (TE) stress and deformation potential (DP) interaction whence their detection proceed via Brillouin scattering. Using a two-temperature model together with strain wave propagation, we discern the TE and DP contributions in strain generation. Hot carrier cooling plays a dominant role in effecting the weak modulation amplitude. Out-of-plane lattice stiffness is reduced by the weak van der Waals bond between organic layers, resulting in a slow strain propagation velocity. Our findings inject fresh insights into the basic strain properties of layered perovskites critical for manipulating their functional properties for new applications.
ISSN: 2375-2548
DOI: 10.1126/sciadv.abq1971
DOI (Related Dataset): 10.21979/N9/5BKLHK
Schools: School of Physical and Mathematical Sciences 
School of Materials Science and Engineering 
Interdisciplinary Graduate School (IGS) 
Research Centres: Energy Research Institute @ NTU (ERI@N) 
Rights: © 2022 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S.Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:ERI@N Journal Articles
IGS Journal Articles
MSE Journal Articles
SPMS Journal Articles

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