Terahertz Vibrational Modes in CH₃NH₃PbI₃ and CsPbI₃ Perovskite Films
摘要
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 (CH₃NH₃⁺, Cs⁺) make a significant contribution to the formation of the observed low-frequency vibrational modes in perovskites under consideration.
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引用格式
@article{jetp-letters-2019,
author = {Andrianov, A. V. and Aleshin, A. N. and Matyushkin, L. B.},
title = {Terahertz Vibrational Modes in CH₃NH₃PbI₃ and CsPbI₃ Perovskite Films},
journal = {JETP Letters},
volume = {109},
number = {1},
pages = {28--32},
year = {2019},
doi = {10.1134/s0021364019010053}
}