Significant THz absorption in CH 3 NH 2 molecular defect-incorporated organic-inorganic hybrid perovskite thin film

Inhee Maeng, Young Mi Lee, Jinwoo Park, Sonia R. Raga, Chul Kang, Chul Sik Kee, Byung Deok Yu, Suklyun Hong, Luis K. Ono, Yabing Qi, Min Cherl Jung, Masakazu Nakamura

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Abstract

The valid strong THz absorption at 1.58 THz was probed in the organic-inorganic hybrid perovskite thin film, CH 3 NH 3 PbI 3 , 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 CH 3 NH 2 molecular defect.

Original languageEnglish
Article number5811
JournalScientific Reports
Volume9
Issue number1
DOIs
StatePublished - 1 Dec 2019

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