Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 8, Issue 2, Pages 401-406Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.6b02691
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Funding
- Midcareer Researcher Program through a National Research Foundation grant - Korean Government (MSIP) [2014R1A2A1A11052108]
- Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant - Korean Government (MOTIE) [20164030201380]
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Vibrational modes in the terahertz (THz) frequency range are good indicators of lead halide perovskite's crystallization phase. We performed real-time THz spectroscopy to monitor the crystallization kinetics in the perovskite films. First, THz absorptance was measured while the perovskite film was annealed at different temperatures. By analyzing the Avrami exponent, we observed an abrupt dimensionality switch (from 1D to 2D) with increasing temperature starting at approximately 90 degrees C. We also monitored the laser-induced crystallinity enhancement of the preannealed perovskite film. The THz absorptance increased initially, then subsequently decayed over a couple of hours, although the enhancement factor varies depending on the film crystallinity. In particular, the Avrami analysis implied that the light-induced crystallization was assisted by the ID diffusion processes. The activation photon energy was measured at 2.3 eV, which indicated that enhanced crystallization originated from the photoinduced structural change of residual lead iodide at the grain boundary.
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