Abstract

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.

Details

Title
Significant THz absorption in CH3NH2 molecular defect-incorporated organic-inorganic hybrid perovskite thin film
Author
Maeng Inhee 1 ; Young, Lee, Mi 2 ; Park, Jinwoo 3 ; Raga, Sonia R 4   VIAFID ORCID Logo  ; Kang, Chul 1 ; Chul-Sik, Kee 1 ; Yu, Byung Deok 3   VIAFID ORCID Logo  ; Hong Suklyun 5 ; Ono, Luis K 6   VIAFID ORCID Logo  ; Qi Yabing 6   VIAFID ORCID Logo  ; Min-Cherl, Jung 7 ; Nakamura, Masakazu 7   VIAFID ORCID Logo 

1  Gwangju Institute of Science and Technology, Advanced Photonics Research Institute, Gwangju, Republic of Korea (GRID:grid.61221.36) (ISNI:0000 0001 1033 9831) 
2  Pohang Accelerator Laboratory, POSTECH, Beamline department, Pohang, Republic of Korea (GRID:grid.49100.3c) (ISNI:0000 0001 0742 4007) 
3  University of Seoul, Department of Physics, Seoul, Republic of Korea (GRID:grid.267134.5) (ISNI:0000 0000 8597 6969) 
4  Okinawa Institute of Science and Technology Graduate University, Energy Materials and Surface Sciences Unit, Okinawa, Japan (GRID:grid.250464.1) (ISNI:0000 0000 9805 2626); Monash University, ARC Centre of Excellence in Exciton Science and Department of Chemical Engineering, Clayton, Australia (GRID:grid.1002.3) (ISNI:0000 0004 1936 7857) 
5  Sejong University, Graphene Research Institute and Department of Physics, Seoul, Republic of Korea (GRID:grid.263333.4) (ISNI:0000 0001 0727 6358) 
6  Okinawa Institute of Science and Technology Graduate University, Energy Materials and Surface Sciences Unit, Okinawa, Japan (GRID:grid.250464.1) (ISNI:0000 0000 9805 2626) 
7  Nara Institute of Science and Technology, Division of Materials Science, Nara, Japan (GRID:grid.260493.a) (ISNI:0000 0000 9227 2257) 
Publication year
2019
Publication date
2019
Publisher
Nature Publishing Group
e-ISSN
20452322
Source type
Scholarly Journal
Language of publication
English
DOI
https://doi.org/10.1038/s41598-019-42359-8
ProQuest document ID
2206211415
Copyright
© The Author(s) 2019. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.