Abstract:
Films of CH3NH3PbI3 organometallic perovskite, which is currently considered as a promising basic material for new-generation solar cells, as well as films containing CsPbI3 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 (CH3 NH+3, Cs+) make a significant contribution to the formation of the observed low-frequency vibrational modes in perovskites under consideration.
Citation:
A. V. Andrianov, A. N. Aleshin, L. B. Matyushkin, “Terahertz vibrational modes in CH3NH3PbI3 and CsPbI3 perovskite films”, Pis'ma v Zh. Èksper. Teoret. Fiz., 109:1 (2019), 30–35; JETP Letters, 109:1 (2019), 28–32
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