@article{oai:oist.repo.nii.ac.jp:00001025,
 author = {Maeng, Inhee and Lee, Young Mi and Park, Jinwoo and Raga, Sonia R. and Kang, Chul and Kee, Chul-Sik and Yu, Byung Deok and Hong, Suklyun and Ono, Luis K. and Qi, Yabing and Jung, Min-Cherl and Nakamura, Masakazu},
 issue = {1},
 journal = {Scientific Reports},
 month = {Apr},
 note = {The valid strong THz absorption at 1.58 THz was probed in the organic-inorganic hybrid perovskite thin film, CH3NH3PbI3, fabricated by sequential vacuum evaporation method. In usual solution-based methods such as 2-step solution and antisolvent, we observed the relatively weak two main absorption peaks at 0.95 and 1.87 THz. The measured absorption spectrum is analyzed by density-functional theory calculations. The modes at 0.95 and 1.87 THz are assigned to the Pb-I vibrations of the inorganic components in the tetragonal phase. By contrast, the origin of the 1.58 THz absorption is due to the structural deformation of Pb-I bonding at the grain boundary incorporated with a CH3NH2 molecular defect.},
 title = {Significant THz absorption in CH3NH2 molecular defect-incorporated organic-inorganic hybrid perovskite thin film},
 volume = {9},
 year = {2019}
}