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Infrared and terahertz studies of phase transitions in the CH.sub.3./sub.NH.sub.3./sub.PbBr.sub.3./sub. perovskite
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SYSNO ASEP 0573779 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Infrared and terahertz studies of phase transitions in the CH3NH3PbBr3 perovskite Author(s) Železný, Jakub (FZU-D) RID, ORCID
Kadlec, Christelle (FZU-D) RID, ORCID
Kamba, Stanislav (FZU-D) RID, ORCID, SAI
Repček, Dalibor (FZU-D) ORCID
Kundu, S. (CA)
Saidaminov, M.I. (CA)Number of authors 6 Article number 174113 Source Title Physical Review B. - : American Physical Society - ISSN 2469-9950
Roč. 107, č. 17 (2023)Number of pages 8 s. Language eng - English Country US - United States Keywords infrared spectroscopy ; photovoltaic materials ; phase transitions Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) R&D Projects EF16_019/0000760 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA21-06802S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support FZU-D - RVO:68378271 UT WOS 001003448500004 EID SCOPUS 85161239370 DOI 10.1103/PhysRevB.107.174113 Annotation We investigated the influence of two structural phase transitions in methylammonium lead tri-bromide CH3NH3PbBr3 (MAPbBr3) single crystals on the activity of polar phonons using time-domain THz transmission and far infrared (IR) reflectance spectra. The fitting using the Lorentz model of damped harmonic oscillators also enables us to determine all the polar phonon parameters, IR response functions, and their temperature dependence. The fit of the far IR spectra provides a nearly perfect quantitative description of the measured reflectance at room temperature using three phonons. On cooling, three IR active phonons of the cubic and tetragonal structures split into 15 separate bands, signaling the transformation to the orthorhombic phase below 150 K. This result is compared with the factor group analysis of the polar phonons in all three crystallographic phases. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2024 Electronic address https://doi.org/10.1103/PhysRevB.107.174113
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