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Strong Linear Correlation between CH 3 NH 2 Molecular Defect and THz-Wave Absorption in CH 3 NH 3 PbI 3 Hybrid Perovskite Thin Film

 Inhee Maeng  ;  Asuka Matsuyama  ;  Jung-Ho Yun  ;  Shenghao Wang  ;  Chul Kang  ;  Chul-Sik Kee  ;  Masakazu Nakamura  ;  Min-Cherl Jung 
 NANOMATERIALS, Vol.10(4) : 721, 2020-04 
Journal Title
Issue Date
CH3NH2 ; THz oscillation strength ; MAPbI(3)
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 degrees 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 degrees 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.
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1. College of Medicine (의과대학) > Research Institute (부설연구소) > 1. Journal Papers
Yonsei Authors
Maeng, In hee(맹인희)
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