Broad-range high-resolution optical spectroscopy of CH3NH3PbBr3 hybrid perovskite single crystals: Optical phonons, absorption edge, phase transitions

Broad-range high-resolution optical spectroscopy of CH3NH3PbBr3 hybrid perovskite single crystals: Optical phonons, absorption edge, phase transitions Full article

Journal

Optical Materials
ISSN: 1873-1252 , E-ISSN: 0925-3467

Output data

Year: 2023, Volume: 20, Pages: 100259 Pages count : 1 DOI: 10.1016/j.omx.2023.100259

Tags

Hybrid perovskite CH3NH3PbBr3, Large single crystals, High-resolution optical spectroscopy, Phonons, Absorption edge, Structural phase transitions

Authors

Anikeeva Vasilisa E. ^1,2 , Boldyrev Kirill N. ¹ , Semenova Olga I. ³ , Sukhikh Taisiya S. ⁴ , Popova Marina N. ¹

Affiliations

1	Institute of Spectroscopy, Russian Academy of Sciences, Fyzicheskaya Street 5, Troitsk, Moscow, 108840, Russia
2	HSE University, Myasnitskaya Street 20, Moscow, 101000, Russia
3	A.V. Rzhanov Institute of Semiconductor Physics, Siberian Branch of the Russian Academy of Sciences, Lavrentiev Avenue 13, Novosibirsk, 630090, Russia
4	Nikolaev Institute of Inorganic Chemistry Siberian Branch of the Russian Academy of Sciences, Lavrentiev Avenue 3, Novosibirsk, 630090, Russia

Funding (2)

1	Ministry of Science and Higher Education of the Russian Federation	121031700313-8
2	Russian Science Foundation	19-72-10132

Vibrational and structural properties have an enormous influence on optoelectronic properties of hybrid halide perovskites CH3NH3PbX3 (X = I, Br, Cl), which are perspective materials for different photovoltaic applications. Here, we report results of the first high-resolution optical spectroscopy measurements of large CH3NH3PbBr3 single crystals in wide frequency (20–20 000 cm􀀀 1) and temperature (5–300 K) ranges. Fit of polarized farinfrared reflection spectra using Lorentz model of damped oscillators revealed parameters of three phonons at room temperature and 38 phonons at 10 K. An analysis of mid-infrared transmission spectra gave evidence of a strong anharmonicity in this hybrid perovskite. A splitting of some lines observed in the orthorhombic phase was presumably assigned to the tunneling of the CH3NH3+ cation molecule between several potential energy minima. The temperature behavior of the transmission spectra near the fundamental absorption edge was tentatively explained by the competition between two different exciton transitions in CH3NH3PbBr3. Positions of spectral lines and of the absorption edge measured at cooling and heating the sample demonstrate hysteresis loops in the vicinities of phase transitions around 237, 155, and 149 K, thus revealing the first-order nature of all three phase transitions in CH3NH3PbBr3.

Anikeeva V.E. , Boldyrev K.N. , Semenova O.I. , Sukhikh T.S. , Popova M.N.
Broad-range high-resolution optical spectroscopy of CH3NH3PbBr3 hybrid perovskite single crystals: Optical phonons, absorption edge, phase transitions
Optical Materials. 2023. V.20. P.100259. DOI: 10.1016/j.omx.2023.100259 Scopus РИНЦ OpenAlex

Submitted:	Jul 13, 2023
Accepted:	Aug 14, 2023
Published print:	Aug 28, 2023
Published online:	Aug 28, 2023

Scopus:	2-s2.0-85169780075
Elibrary:	59402186
OpenAlex:	W4386226010

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