2018 Fiscal Year Research-status Report
Physical understanding of defects in organometal halide perovskite
| Project/Area Number |
17K05033
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| Research Institution | Nara Institute of Science and Technology |
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Principal Investigator |
JUNG MINCHERL 奈良先端科学技術大学院大学, 先端科学技術研究科, 特任助教 (40632071)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Keywords | THz-wave absorption / Pb-I vibration mode / Defects / OHP / Chemical state / Atomic structure |
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| Outline of Annual Research Achievements |
- We have estibilished the SVE method to control defects in organohalide hybrid perovskite (OHP) thin film.
- In the case of MAPbI3, we found the THz-wave absorption at 1.58 THz with 50% of transmission and 11000 cm－1 of absorption coefficient which is originated from CH3NH2 molecular defect incorporated perovskite structure. (New finding of physical property)
- In the case of FAPbI3, we found the THz-wave absorption at 1.62 THz with 60% of transmission which is originated from delta- and alpha-phse mixed perovskite structure.(New finding of physical property)
- From these results, we confirmed that the understanding of Pb-I (metal cation-halogen anion) vibration mode with defect structure is the main key to control the THz-wave absorption property.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
At the last year, three students (MS 2, Ph.D 1) had joined in my research and the research speed was boosted up. That reason was why we obtained several important results.
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| Strategy for Future Research Activity |
1. Finding a protection material and confirming an interface state
- To avoid any contamination on OHP thin film
- To understand an interface state such as intermixed state
2. Fabrication of halogen mixed hybrid perovskite and its THz-wave absorption property
3. Understanding a fundamental phonon dispersion for THz-wave absorption
4. If possbile, we will try to make a test device for THz-wave sensing.
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