Cargando…

Acoustic Anomalies and the Critical Slowing-Down Behavior of MAPbCl(3) Single Crystals Studied by Brillouin Light Scattering

Inelastic light scattering spectra of organic–inorganic halide perovskite MAPbCl(3) single crystals were investigated by using Brillouin spectroscopy. Sound velocities and acoustic absorption coefficients of longitudinal and transverse acoustic modes propagating along the cubic [100] direction were...

Descripción completa

Detalles Bibliográficos
Autores principales: Lee, Jeong Woo, Naqvi, Furqanul Hassan, Ko, Jae-Hyeon, Kim, Tae Heon, Ahn, Chang Won
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9145713/
https://www.ncbi.nlm.nih.gov/pubmed/35629720
http://dx.doi.org/10.3390/ma15103692
_version_ 1784716382939643904
author Lee, Jeong Woo
Naqvi, Furqanul Hassan
Ko, Jae-Hyeon
Kim, Tae Heon
Ahn, Chang Won
author_facet Lee, Jeong Woo
Naqvi, Furqanul Hassan
Ko, Jae-Hyeon
Kim, Tae Heon
Ahn, Chang Won
author_sort Lee, Jeong Woo
collection PubMed
description Inelastic light scattering spectra of organic–inorganic halide perovskite MAPbCl(3) single crystals were investigated by using Brillouin spectroscopy. Sound velocities and acoustic absorption coefficients of longitudinal and transverse acoustic modes propagating along the cubic [100] direction were determined in a wide temperature range. The sound velocities exhibited softening upon cooling in the cubic phase, which was accompanied by the increasing acoustic damping. The obtained relaxation time showed a critical slowing-down behavior, revealing the order–disorder nature of the phase transition, which is consistent with the growth of strong central peaks upon cooling toward the phase transition point. The temperature dependences of the two elastic constants C(11) and C(44) were obtained in the cubic phase for the first time. The comparison of C(11) and C(44) with those of other halide perovskites showed that C(11) of MAPbCl(3) is larger and C(44) is slightly smaller compared to the values of MAPbBr(3) and MAPbI(3). It suggests that MAPbCl(3) has a more compact structure (smaller lattice constant) along with stronger binding forces, causing larger C(11) and bulk modulus in this compound, and that the shear rigidity is exceedingly small similar to other halide perovskites. The reported elastic constants in this study may serve as a testbed for theoretical and calculational approaches for MAPbCl(3).
format Online
Article
Text
id pubmed-9145713
institution National Center for Biotechnology Information
language English
publishDate 2022
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-91457132022-05-29 Acoustic Anomalies and the Critical Slowing-Down Behavior of MAPbCl(3) Single Crystals Studied by Brillouin Light Scattering Lee, Jeong Woo Naqvi, Furqanul Hassan Ko, Jae-Hyeon Kim, Tae Heon Ahn, Chang Won Materials (Basel) Article Inelastic light scattering spectra of organic–inorganic halide perovskite MAPbCl(3) single crystals were investigated by using Brillouin spectroscopy. Sound velocities and acoustic absorption coefficients of longitudinal and transverse acoustic modes propagating along the cubic [100] direction were determined in a wide temperature range. The sound velocities exhibited softening upon cooling in the cubic phase, which was accompanied by the increasing acoustic damping. The obtained relaxation time showed a critical slowing-down behavior, revealing the order–disorder nature of the phase transition, which is consistent with the growth of strong central peaks upon cooling toward the phase transition point. The temperature dependences of the two elastic constants C(11) and C(44) were obtained in the cubic phase for the first time. The comparison of C(11) and C(44) with those of other halide perovskites showed that C(11) of MAPbCl(3) is larger and C(44) is slightly smaller compared to the values of MAPbBr(3) and MAPbI(3). It suggests that MAPbCl(3) has a more compact structure (smaller lattice constant) along with stronger binding forces, causing larger C(11) and bulk modulus in this compound, and that the shear rigidity is exceedingly small similar to other halide perovskites. The reported elastic constants in this study may serve as a testbed for theoretical and calculational approaches for MAPbCl(3). MDPI 2022-05-21 /pmc/articles/PMC9145713/ /pubmed/35629720 http://dx.doi.org/10.3390/ma15103692 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Lee, Jeong Woo
Naqvi, Furqanul Hassan
Ko, Jae-Hyeon
Kim, Tae Heon
Ahn, Chang Won
Acoustic Anomalies and the Critical Slowing-Down Behavior of MAPbCl(3) Single Crystals Studied by Brillouin Light Scattering
title Acoustic Anomalies and the Critical Slowing-Down Behavior of MAPbCl(3) Single Crystals Studied by Brillouin Light Scattering
title_full Acoustic Anomalies and the Critical Slowing-Down Behavior of MAPbCl(3) Single Crystals Studied by Brillouin Light Scattering
title_fullStr Acoustic Anomalies and the Critical Slowing-Down Behavior of MAPbCl(3) Single Crystals Studied by Brillouin Light Scattering
title_full_unstemmed Acoustic Anomalies and the Critical Slowing-Down Behavior of MAPbCl(3) Single Crystals Studied by Brillouin Light Scattering
title_short Acoustic Anomalies and the Critical Slowing-Down Behavior of MAPbCl(3) Single Crystals Studied by Brillouin Light Scattering
title_sort acoustic anomalies and the critical slowing-down behavior of mapbcl(3) single crystals studied by brillouin light scattering
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9145713/
https://www.ncbi.nlm.nih.gov/pubmed/35629720
http://dx.doi.org/10.3390/ma15103692
work_keys_str_mv AT leejeongwoo acousticanomaliesandthecriticalslowingdownbehaviorofmapbcl3singlecrystalsstudiedbybrillouinlightscattering
AT naqvifurqanulhassan acousticanomaliesandthecriticalslowingdownbehaviorofmapbcl3singlecrystalsstudiedbybrillouinlightscattering
AT kojaehyeon acousticanomaliesandthecriticalslowingdownbehaviorofmapbcl3singlecrystalsstudiedbybrillouinlightscattering
AT kimtaeheon acousticanomaliesandthecriticalslowingdownbehaviorofmapbcl3singlecrystalsstudiedbybrillouinlightscattering
AT ahnchangwon acousticanomaliesandthecriticalslowingdownbehaviorofmapbcl3singlecrystalsstudiedbybrillouinlightscattering