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Open AccessArticle

Strong Linear Correlation between CH3NH2 Molecular Defect and THz-Wave Absorption in CH3NH3PbI3 Hybrid Perovskite Thin Film

1
Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, Gwangju 61005, Korea
2
Division of Materials Science, Nara Institute of Science and Technology, Nara 630-0192, Japan
3
School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology (AIBN), University of Queensland, Brisbane QLD 4027, Australia
4
Materials Genome Institute, Shanghai University, Shanghai 200444, China
5
Division of Materials Science, Faculty of Pure and Applied Sciences, University of Tsukuba, Ibaraki 305-8577, Japan
*
Author to whom correspondence should be addressed.
Current affiliation: YUHS-KRIBB, Medical Convergence Research Institute, College of Medicine, Yonsei University, Seoul 03722, Korea.
Nanomaterials 2020, 10(4), 721; https://doi.org/10.3390/nano10040721
Received: 11 March 2020 / Revised: 2 April 2020 / Accepted: 7 April 2020 / Published: 10 April 2020
(This article belongs to the Special Issue Hybrid Perovskite Thin Film)
To control the density of a CH3NH2 molecular defect, which strongly contributed to a significant THz-wave absorption property in the CH3NH3PbI3 hybrid perovskite thin film formed by the sequential vacuum evaporation method, we performed post-annealing processes with various temperatures and times. In the thin film after post-annealing at 110 °C for 45 min, the density of the CH3NH2 molecular defect was minimized, and CH3NH3I and PbI2 disappeared in the thin film after the post-annealing process at 150 °C for 30 min. However, the density of the CH3NH2 molecular defect increased. Moreover, the THz-wave absorption property for each thin film was obtained using a THz time-domain spectroscopy to understand the correlation between the density of a molecular defect and the THz-wave oscillation strength at 1.6 THz, which originated in the molecular defect-incorporated hybrid perovskite structure. There is a strong linear correlation between the oscillator strength of a significant THz-wave absorption at 1.6 THz and the CH3NH2 molecular defect density. View Full-Text
Keywords: CH3NH2; THz oscillation strength; MAPbI3 CH3NH2; THz oscillation strength; MAPbI3
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MDPI and ACS Style

Maeng, I.; Matsuyama, A.; Yun, J.-H.; Wang, S.; Kang, C.; Kee, C.-S.; Nakamura, M.; Jung, M.-C. Strong Linear Correlation between CH3NH2 Molecular Defect and THz-Wave Absorption in CH3NH3PbI3 Hybrid Perovskite Thin Film. Nanomaterials 2020, 10, 721.

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