2016 Fiscal Year Annual Research Report
Atomic-scale study of optical property of transition metal dichacogenides
| Project/Area Number |
16F16045
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| Research Institution | Institute of Physical and Chemical Research |
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Principal Investigator |
金 有洙 国立研究開発法人理化学研究所, Kim表面界面科学研究室, 主任研究員 (50373296)
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| Co-Investigator(Kenkyū-buntansha) |
WALEN HOLLY 国立研究開発法人理化学研究所, Kim表面界面科学研究室, 外国人特別研究員
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| Project Period (FY) |
2016-10-07 – 2019-03-31
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| Keywords | STM / insulating monolayer |
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| Outline of Annual Research Achievements |
Dr. Walen has successfully built an UHV chamber in order to grow h-BN films on a metal substrate, followed by optimizing h-BN film growth condition. Finally, she fabricated a well-grown h-BN monolayer islands on a Cu(111) single-crystal surface. The quality of h-BN monolayers was then analyzed and confirmed by LEED, XPS and STM.
The h-BN monolayer growth was tested to examine if it is applicable to electronic decoupling between a molecular adsorbate and metal substrate. Single molecule fluorescence measurement is the most powerful method to do that, because fluorescence cannot be measured if the coupling is not enough. She measured a weak fluorescence signal from a free-base phthalocyanine molecule on the h-BN/Cu(111), which implies that the electric decoupling is not enough.
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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
It is crucial to introduce ultrathin insulating film between the molecule and metal substrate. Dr. Walen has successfully fabricate an well-defined insulating h-BN monolayer on the Cu substrate. Although it turned out that the monolayer was not enough to decouple electronic hybridization between molecular orbital and metal d band, she found that multilayers of h-BN might be able to be used as a good insulater.
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| Strategy for Future Research Activity |
Multilayer of h-BN will be fabricated on Ni single-crystal surface, because Cu surface allows only a monolayer film. Single-molecule fluorescence measurement from a free-base phthalocyanine molecule on the multilayer h-BN/Ni(111) will be carried out for examining electronic decoupling. Finally, TMD layers will be transferred on to the multilayer h-BN/Ni(111) to investigate local electronic structure.
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