Terahertz Optical Characteristics of Organometallic Lead-Iodide (Bromide) Perovskites and Cesium Lead Halide Nanocrystals
要旨
Optical properties of organometallic lead-iodide (bromide) perovskites CH₃NH₃PbI₃ (CH₃NH₃PbBr₃) and cesium lead halide nanocrystals CsPbI₃ have been studied in the 0.2-2.9 THz spectral range. THz spectra of CH₃NH₃PbI₃ perovskite demonstrate several resonant features, which were previously attributed to low-frequency phonon modes associated with vibrations of Pb-I bonds. However, observed changes in THz spectra of studied perovskites under substitution of I by Br or methyl-ammonium group (CH₃NH₃) by Cs make the previous interpretation of main low-frequency phonon modes in CH₃NH₃PbI₃ perovskite questionable. It is conceivable that vibrations of cation (CH₃NH₃⁺, Cs⁺) strongly contribute to the formation of main THz phonon modes of the perovskite.
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引用方法
@inproceedings{irmmw-thz-perovskite-2018,
author = {Andrianov, A.V. and Aleshin, A.N. and Zakhar'in, A.O. and Matyushkin, L. B.},
title = {Terahertz Optical Characteristics of Organometallic Lead-Iodide (Bromide) Perovskites and Cesium Lead Halide Nanocrystals},
booktitle = {2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)},
pages = {1--2},
year = {2018},
doi = {10.1109/irmmw-thz.2018.8509947}
}