A. V. Andrianov, A. N. Aleshin, L. B. Matyushkin, “Terahertz vibrational modes in CH$_3$NH$_3$PbI$_3$ and CsPbI$_3$ perovskite films”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2019, Volume 109, Issue 1,Pages 30

This article is cited in 16 papers

CONDENSED MATTER

Terahertz vibrational modes in CH$_3$NH$_3$PbI$_3$ and CsPbI$_3$ perovskite films

A. V. Andrianov^a, A. N. Aleshin^a, L. B. Matyushkin^b

^a Ioffe Physical–Technical Institute, Russian Academy of Sciences, St. Petersburg, Russia
^b St. Petersburg State Electrotechnical University LETI, St. Petersburg, Russia

Abstract: 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.

Received: 18.09.2018
Revised: 26.10.2018
Accepted: 08.11.2018

DOI: 10.1134/S0370274X19010065