Observation of elastic heterogeneity and phase evolution in 2D layered perovskites using coherent acoustic phonons

Two-dimensional (2D) organic–inorganic perovskites have shown interesting optical properties due to the natural quantum-well structures. The repetition of soft organic and hard inorganic intercalations also renders 2D perovskites rich phonon dynamics. Here, we investigated the coherent acoustic phon...

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Autores principales:	Wang Junzhong, Zhu Jiaqi, Jiang Yiqi, Li Mengying, Yu Kuai, Wang Guo Ping
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	acoustic phonon elastic heterogeneity perovskite time-domain brillouin spectroscopy Physics QC1-999
Acceso en línea:	https://doaj.org/article/1240e1372c7d446dbc990e1c4beeea99
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spelling	oai:doaj.org-article:1240e1372c7d446dbc990e1c4beeea992021-12-05T14:10:56ZObservation of elastic heterogeneity and phase evolution in 2D layered perovskites using coherent acoustic phonons2192-861410.1515/nanoph-2021-0358https://doaj.org/article/1240e1372c7d446dbc990e1c4beeea992021-10-01T00:00:00Zhttps://doi.org/10.1515/nanoph-2021-0358https://doaj.org/toc/2192-8614Two-dimensional (2D) organic–inorganic perovskites have shown interesting optical properties due to the natural quantum-well structures. The repetition of soft organic and hard inorganic intercalations also renders 2D perovskites rich phonon dynamics. Here, we investigated the coherent acoustic phonons in (PEA)2PbI4 perovskite films by time-resolved Brillouin spectroscopy. The coherent acoustic phonons were launched indirectly in perovskite films by exciting Au nanoplates which were used as optoacoustic transducers. A longitudinal sound velocity ν = 1937 ± 31 m/s, and an elastic modulus E = 9.84 GPa along the cross-plane direction of perovskites were obtained from analysis of the Brillouin oscillation frequency. Following a bead-spring model, we calculated a spring constant k ≈ 1.709 N m−1 for PEA cations which is comparably small for perovskites. We also demonstrated that coherent acoustic phonons are sensitive to differentiate structural heterogeneity and monitor dynamic phase evolution in perovskite films. Domains of PbI2-rich and PbI2-poor phases were identified. Under light stimulus, PbI2-poor phases were gradually disappearing and PbI2-rich phases became crystallized. The observations of structural and elastic heterogeneity and dynamic phase evolution using coherent acoustic phonons provide a toolbox for submicroscale elastic characterization of perovskites.Wang JunzhongZhu JiaqiJiang YiqiLi MengyingYu KuaiWang Guo PingDe Gruyterarticleacoustic phononelastic heterogeneityperovskitetime-domain brillouin spectroscopyPhysicsQC1-999ENNanophotonics, Vol 10, Iss 16, Pp 4009-4017 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	acoustic phonon elastic heterogeneity perovskite time-domain brillouin spectroscopy Physics QC1-999
spellingShingle	acoustic phonon elastic heterogeneity perovskite time-domain brillouin spectroscopy Physics QC1-999 Wang Junzhong Zhu Jiaqi Jiang Yiqi Li Mengying Yu Kuai Wang Guo Ping Observation of elastic heterogeneity and phase evolution in 2D layered perovskites using coherent acoustic phonons
description	Two-dimensional (2D) organic–inorganic perovskites have shown interesting optical properties due to the natural quantum-well structures. The repetition of soft organic and hard inorganic intercalations also renders 2D perovskites rich phonon dynamics. Here, we investigated the coherent acoustic phonons in (PEA)2PbI4 perovskite films by time-resolved Brillouin spectroscopy. The coherent acoustic phonons were launched indirectly in perovskite films by exciting Au nanoplates which were used as optoacoustic transducers. A longitudinal sound velocity ν = 1937 ± 31 m/s, and an elastic modulus E = 9.84 GPa along the cross-plane direction of perovskites were obtained from analysis of the Brillouin oscillation frequency. Following a bead-spring model, we calculated a spring constant k ≈ 1.709 N m−1 for PEA cations which is comparably small for perovskites. We also demonstrated that coherent acoustic phonons are sensitive to differentiate structural heterogeneity and monitor dynamic phase evolution in perovskite films. Domains of PbI2-rich and PbI2-poor phases were identified. Under light stimulus, PbI2-poor phases were gradually disappearing and PbI2-rich phases became crystallized. The observations of structural and elastic heterogeneity and dynamic phase evolution using coherent acoustic phonons provide a toolbox for submicroscale elastic characterization of perovskites.
format	article
author	Wang Junzhong Zhu Jiaqi Jiang Yiqi Li Mengying Yu Kuai Wang Guo Ping
author_facet	Wang Junzhong Zhu Jiaqi Jiang Yiqi Li Mengying Yu Kuai Wang Guo Ping
author_sort	Wang Junzhong
title	Observation of elastic heterogeneity and phase evolution in 2D layered perovskites using coherent acoustic phonons
title_short	Observation of elastic heterogeneity and phase evolution in 2D layered perovskites using coherent acoustic phonons
title_full	Observation of elastic heterogeneity and phase evolution in 2D layered perovskites using coherent acoustic phonons
title_fullStr	Observation of elastic heterogeneity and phase evolution in 2D layered perovskites using coherent acoustic phonons
title_full_unstemmed	Observation of elastic heterogeneity and phase evolution in 2D layered perovskites using coherent acoustic phonons
title_sort	observation of elastic heterogeneity and phase evolution in 2d layered perovskites using coherent acoustic phonons
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/1240e1372c7d446dbc990e1c4beeea99
work_keys_str_mv	AT wangjunzhong observationofelasticheterogeneityandphaseevolutionin2dlayeredperovskitesusingcoherentacousticphonons AT zhujiaqi observationofelasticheterogeneityandphaseevolutionin2dlayeredperovskitesusingcoherentacousticphonons AT jiangyiqi observationofelasticheterogeneityandphaseevolutionin2dlayeredperovskitesusingcoherentacousticphonons AT limengying observationofelasticheterogeneityandphaseevolutionin2dlayeredperovskitesusingcoherentacousticphonons AT yukuai observationofelasticheterogeneityandphaseevolutionin2dlayeredperovskitesusingcoherentacousticphonons AT wangguoping observationofelasticheterogeneityandphaseevolutionin2dlayeredperovskitesusingcoherentacousticphonons
_version_	1718371584224264192

Observation of elastic heterogeneity and phase evolution in 2D layered perovskites using coherent acoustic phonons

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