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Parallel Alignment of Methylammonium Cations in an Orthorhombic CH3NH3PbCl3 Single Crystal Observed by Polarized Micro-Raman Scattering Spectroscopy

Title
Parallel Alignment of Methylammonium Cations in an Orthorhombic CH3NH3PbCl3 Single Crystal Observed by Polarized Micro-Raman Scattering Spectroscopy
Authors
Kim, YejinBae, SoungminPark, JooheeTrang Thi Thu NguyenJung, Hye RiJo, WilliamKim, Yong-HoonRaebiger, HannesYoon, Seokhyun
Ewha Authors
조윌렴윤석현
SCOPUS Author ID
조윌렴scopus; 윤석현scopus
Issue Date
2022
Journal Title
CHEMISTRY OF MATERIALS
ISSN
0897-4756JCR Link

1520-5002JCR Link
Citation
CHEMISTRY OF MATERIALS vol. 34, no. 7, pp. 2972 - 2980
Publisher
AMER CHEMICAL SOC
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
To increase their efficiency and improve their chemical stability, hybrid organic-inorganic perovskites (HOIPs) have been studied intensely over the past few years. There are some unresolved issues with the properties of HOIPs, such as the relation between the configuration of methylammonium (MA) ions and their electronic and structural properties. For example, it was theoretically proposed that the change in the bandgap from direct to indirect and/or structural distortion can be caused by a change in the orientation of the MA ions with respect to the PbX3 cage in CH3NH3PbX3 (X = I, Br, or Cl). By using polarized Raman scattering spectroscopy, we experimentally show that the MA ions in CH3NH3PbCl3 single crystals are parallelly oriented toward a special crystallographic direction in the low-temperature orthorhombic phase at least on our measurement scale of approximately square micrometers. Experimental measurement results verified by density functional theory calculations indicate the presence of a macroscopic domain consists of a parallel directional alignment of the MA ions, a strong signature of ferroelectricity in HOIPs.
DOI
10.1021/acs.chemmater.1c03744
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자연과학대학 > 물리학전공 > Journal papers
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