Strong Linear Correlation between CH3NH2 Molecular Defect and THz-Wave Absorption in CH3NH3PbI3 Hybrid Perovskite Thin Film
| Autor: | Chul Kang, Inhee Maeng, Masakazu Nakamura, Asuka Matsuyama, Min-Cherl Jung, Shenghao Wang, Jung-Ho Yun, Chul-Sik Kee |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Terahertz radiation Oscillator strength General Chemical Engineering CH3NH2 02 engineering and technology 010402 general chemistry 01 natural sciences Molecular physics Article Vacuum evaporation MAPbI3 lcsh:Chemistry General Materials Science Thin film Absorption (electromagnetic radiation) Spectroscopy Perovskite (structure) Oscillation 021001 nanoscience & nanotechnology 0104 chemical sciences THz oscillation strength lcsh:QD1-999 0210 nano-technology |
| Zdroj: | Nanomaterials Volume 10 Issue 4 Nanomaterials, Vol 10, Iss 721, p 721 (2020) |
| ISSN: | 2079-4991 |
| DOI: | 10.3390/nano10040721 |
| Popis: | To control the density of a CH3NH2 molecular defect, which strongly contributed to a significant THz-wave absorption property in the CH3NH3PbI3 hybrid perovskite thin film formed by the sequential vacuum evaporation method, we performed post-annealing processes with various temperatures and times. In the thin film after post-annealing at 110 ° C for 45 min, the density of the CH3NH2 molecular defect was minimized, and CH3NH3I and PbI2 disappeared in the thin film after the post-annealing process at 150 ° C for 30 min. However, the density of the CH3NH2 molecular defect increased. Moreover, the THz-wave absorption property for each thin film was obtained using a THz time-domain spectroscopy to understand the correlation between the density of a molecular defect and the THz-wave oscillation strength at 1.6 THz, which originated in the molecular defect-incorporated hybrid perovskite structure. There is a strong linear correlation between the oscillator strength of a significant THz-wave absorption at 1.6 THz and the CH3NH2 molecular defect density. |
| Databáze: | OpenAIRE |
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