Terahertz Vibrational Modes in CH3NH3PbI3 and CsPbI3 Perovskite Films

Films of CH 3 NH 3 PbI 3 organometallic perovskite, which is currently considered as a promising basic material for new-generation solar cells, as well as films containing CsPbI 3 inorganic lead–halid perovskite nanocrystals, have been studied in the spectral range of 0.2–2.9 THz at room temperature...

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Bibliographic Details
Published in:	JETP letters Vol. 109; no. 1; pp. 28 - 32
Main Authors:	Andrianov, A. V., Aleshin, A. N., Matyushkin, L. B.
Format:	Journal Article
Language:	English
Published:	Moscow Pleiades Publishing 2019 Springer Nature B.V
Subjects:	Ammonia Atomic Biological and Medical Physics Biophysics Condensed Matter Molecular Nanocrystals Optical and Plasma Physics Particle and Nuclear Physics Perovskites Photovoltaic cells Physics Physics and Astronomy Quantum Information Technology Solar cells Solid State Physics Spintronics
Online Access:	Get full text
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Summary:	Films of CH 3 NH 3 PbI 3 organometallic perovskite, which is currently considered as a promising basic material for new-generation solar cells, as well as films containing CsPbI 3 inorganic lead–halid perovskite nanocrystals, have been studied in the spectral range of 0.2–2.9 THz at room temperature by terahertz time-domain spectroscopy. Several low-frequency vibrational modes previously attributed exclusively to vibrations of Pb–I bonds have been observed in the perovskite films under investigation in this spectral range. The comparison of terahertz characteristics of perovskites under study has shown that vibrations associated with a cation (CH 3 NH 3 + , Cs + ) make a significant contribution to the formation of the observed low-frequency vibrational modes in perovskites under consideration.
ISSN:	0021-3640 1090-6487
DOI:	10.1134/S0021364019010053