標題: Observation of strain-induced phonon mode splitting in the tetragonal hybrid halide perovskite
作者: Ahn, Hyeyoung
Huang, Hsin
Hsieh, Meng-I
Li, Ming-Hsien
Chen, Peter
光電工程學系
Department of Photonics
公開日期: 1-Nov-2017
摘要: We report the structural and low-frequency vibrational properties of methylammonium lead-iodide (MAPbI(3)) perovskites studied by terahertz spectroscopy. The characteristic low-frequency mode splitting is observed in room-temperature tetragonal MAPbI(3) films grown on Si, and the frequencies of split modes are found to coincide with those of orthorhombic phases. The strain arising from the symmetry and lattice mismatch against the substrates is responsible for the local distortion of inorganic cages and results in the mode-splitting. The use of a mesoporous TiO2 interlayer effectively reduces the strain at the perovskite-substrate interface and induces larger grain growth and the improvement of structural ordering in the tetragonal MAPbI(3) films. (C) 2017 The Japan Society of Applied Physics
URI: http://dx.doi.org/10.7567/JJAP.56.110307
http://hdl.handle.net/11536/143936
ISSN: 0021-4922
DOI: 10.7567/JJAP.56.110307
期刊: JAPANESE JOURNAL OF APPLIED PHYSICS
Volume: 56
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