2017 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, 物質創成科学研究科, 特任助教 (40632071)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Keywords | Surface defect structure / Chemical instability / Material instability |
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| Outline of Annual Research Achievements |
In this year, the most important research targets were 1) Construction of vacuum chamber and 2) Confirmation of organohalide perovksite thin film fabrication. We completed the plan smoothly. The first manuscript using the constructed chamber is published at The Journal of Physical Chemistry Letters (IF=9.353)
The detailed progress:
1. We have performed the constructuion of vacuum chamber for the fabricaiton of organohalide perovksite thin film. And in the pre-testing experiment, we confirmed the sequntial vacuum evaporation method was useful.
2. To understand the instability of Sn-based perovskite, CH3NH3SnI3, photoelectron spectroscopy with synchrotron radiation and theoretical calculations, such as density functional theory and ab-initio molecular dynamics, were performed. Findings from this experimental and theoretical study highlight the crucial changes of surface-chemical states, the broken chemical bondings in Sn-I, and the depletion of a CH3-NH3+ cation on the surface region. The material instability origin of Sn-based perovskite can be explained by the chemical state instability in the surface.
3. Now, the manuscript is published at The Journal of Physical Chemistry Letters (IF=9.353). (https://pubs.acs.org/doi/10.1021/acs.jpclett.8b00494) (The reviewer mentioned our manuscript would be in TOP 10% reading in Journal of Physical Chemistry Letters)
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
According to the proposed plan, the research is going very smoothly. There is no problem.
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| Strategy for Future Research Activity |
1. We will focus on the molecular defect at the grain boundary such as CH3NH2. We would like to understand the perovksite stability at the grain boundary and its effect in the device performance.
2. And we will prepare to see the interface and possible defects in there between organohalide perovksite thin film and hole transport layer (HTL). We already decided to use P40 polymer for HTL.
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| Causes of Carryover |
Several items in the intial plan are still considering to buy very carefully. They will be purchased at the next year.
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[Presentation] The presence of CH3NH2 neutral species and different chemical states between surface and bulk in organometal halide perovskite film2017
Author(s)
Min-Cherl Jung, Young Mi Lee, Han-Koo Lee, Jinwoo Park, Sonia R. Raga, Luis K. Ono, Shenghao Wang, Matthew R. Leyden, Byung Deok Yu, Suklyun Hong, Yabing Qi
Organizer
ELECTRONIC STRUCTURE AND PROCESSES AT MOLECULAR-BASED INTERFACES" (ESPMI 9)
Int'l Joint Research
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[Presentation] Observation of chemical defect in CH3NH3PbI3 thin film using synchrotron radiation2017
Author(s)
Young Mi Lee, Min-Cherl Jung, Han-Koo Lee, Jinwoo Park, Sonia R. Raga, Luis K. Ono, Shenghao Wang, Matthew R. Leyden, Byung Deok Yu, Suklyun Hong, and Yabing Qi
Organizer
The 8th International Symposium on Surface Science
Int'l Joint Research
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[Presentation] Observation of THz absorption on organic-inorganic hybrid perovskites using THz time-domain spectroscopy2017
Author(s)
I. Maeng, J. Park, Y. M. Lee, S. R. Raga, L. K. Ono, Y. Qi, S. Hong, B. D. Yu, C. Kang, C.-S. Kee, M.-C. Jung, and M. Nakamura
Organizer
The 8th International Symposium on Surface Science
Int'l Joint Research
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