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Title: Lattice dynamics in perovskite halides CsSn X 3 with X = I ,   Br ,   Cl

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics

The first-principles linear response approach is used within the local-density approximation to calculate the full phonon band structures and phonon density of states (DOS) of CsSnX3 (X=Cl, Br, or I) in different phases. The relations between soft phonon modes and phase transitions are investigated. We find soft phonon modes only in the cubic and tetragonal phases, not in the orthorhombic and monoclinic phases. A dispersionless soft phonon branch spreads from the k point M to R in the Brillouin zone of the cubic phase. The lower symmetry tetragonal phase results from the condensation of the soft phonon mode at the k point M. Additionally, the condensation of the soft phonon mode at the k point Z in the Brillouin zone of tetragonal phase results in the orthorhombic γ phase. To facilitate comparison with experimental data, we calculate infrared spectra for the cubic phase. At this point only a limited comparison with experimental data is possible. We find that the calculated modes agree with the available experimental data when we assign the second and third calculated modes to the experimental first and second modes. The lowest calculated mode is at a frequency where the phonon DOS has a maximum value. So the strong phonon-phonon interaction results in short phonon lifetime or strong broadening, which could explain why this mode has not been observed. Our first-principles calculated IR spectra show that the third observed mode in IR absorption is actually the highest longitudinal optical (LO) rather than transverse optical mode. We show, furthermore, that a strong LO-plasmon coupling may be expected in these materials and can explain observed Raman data for CsSnI3.

Research Organization:
Case Western Reserve Univ., Cleveland, OH (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0008933; ER 46874–SC0008933
OSTI ID:
1593456
Alternate ID(s):
OSTI ID: 1180124
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Vol. 90, Issue 19; ISSN 1098-0121
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 68 works
Citation information provided by
Web of Science

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Cited By (8)

Band Gaps and Stability of CsSiX 3 Halides journal February 2019
Effect of chemical nature of atoms on the electronic, dielectric, and dynamical properties of ABX 3 halide perovskite journal May 2020
Dynamic emission Stokes shift and liquid-like dielectric solvation of band edge carriers in lead-halide perovskites journal March 2019
Modulation of electronic and optical properties in mixed halide perovskites CsPbCl 3 x Br 3(1- x ) and CsPbBr 3 x I 3(1- x ) journal March 2017
Disappeared deep charge-states transition levels in the p-type intrinsic CsSnCl 3 perovskite journal May 2019
Atomic structure of metal-halide perovskites from first principles: The chicken-and-egg paradox of the organic-inorganic interaction journal July 2016
Phonon anharmonicity, lifetimes, and thermal transport in CH 3 NH 3 PbI 3 from many-body perturbation theory journal December 2016
Atomic structure of metal-halide perovskites from first principles: The chicken-and-egg paradox of the organic-inorganic interaction text January 2016

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