Journal
APPLIED PHYSICS EXPRESS
Volume 12, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.7567/1882-0786/ab0eec
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Funding
- JSPS KAKENHI (Japan) [17K05033]
- Basic Science Research Program through the National Research Foundation of Korea [NRF-2015R1C1A2A01054543, NRF-2018R1D1A1B07042814, NRF-2018R1D1A1B07047762]
- Ministry of Education of the Republic of Korea
- Australian Research Council through its DECRA
- Programs for Professor of Special Appointment and Distinguished Visiting Professor (Eastern Scholar) at the Shanghai Institutions of Higher Learning
- Australian Research Council through its DP
- Grants-in-Aid for Scientific Research [17K05033] Funding Source: KAKEN
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The flexible and mixed delta- and alpha-formamidinium lead iodide (FAPbI(3)) hybrid perovskite thin films fabricated by the sequential vacuum evaporation method (SVE) were studied using the THz-wave absorption property. The formed FAPbI(3) using SVE showed the typical delta-phase. After annealing for 10 min, we confirmed a mixed state with delta- and alpha-phases and observed THz-wave absorption at 1.62 THz with 40% absorptance. In the C 1s core-level spectra, we found two different chemical states originated from delta- and alpha-FAPbI(3). The origin of the THz-wave absorption property is assumed from a significant Pb-I vibration mode from the mixed phases in FAPbI(3). (C) 2019 The Japan Society of Applied Physics
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