2018 Fiscal Year Annual Research Report
Molecular Transistor operating by Resonant-Tunneling
| Project/Area Number |
18J14287
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
LEE Seungjoo 東京工業大学, 物質理工学院, 特別研究員(DC2)
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| Project Period (FY) |
2018-04-25 – 2020-03-31
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| Keywords | MolecularTransistor / Resonant-Tunneling / RoomTemperatureOperation |
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| Outline of Annual Research Achievements |
Molecular electronic devices have been intensively researched as the next-generation transistor in the academia. Here, we proposed single molecular resonant-tunneling transistor based on quinoidal fused oligosiole derivative with hemispheric electroless gold plated (H-ELGP) Pt-based nanogap electrodes.
Main objective of this study is to realize room temperature operating single molecular resonant-tunneling transistor. For this, bridged molecular structure was proposed. It is easily expected to have the most stable transistor operation under the room temperature as a molecule was bridged between nanogap electrodes. From the experimental results, under the bridged molecular structure, single molecular transistor showed the most stable transistor operation even under the room temperature.
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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
Regarding to research plan of this fiscal year, realization of room temperature operation of molecular transistor was proposed. Recently, single molecular resonant-tunneling transistor based on quinoidal fused oligosilole derivative with hemispheric electroless gold plated (H-ELGP) Pt-based nanogap electrodes showed extremely stable transistor operation even under the room temperature. The key point of this was to form the bridged molecular structure. On to off current ratio of this single molecular transistor was about 2000 and operating voltage of that was only 1 mV. However, on to off current ratio was significantly diminished as temperature increased. On to off current ratio under the room temperature was only 3.5.
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| Strategy for Future Research Activity |
We have realized room temperature operating single molecular transistor by quinoidal fused oligosilole derivatives. Extremely stable room temperature operation was indeed realized. However, one of big challenge of this was on to off current ratio drop as temperature increased. To solve this problem, we synthesized new derivative to have much higher on to off current ratio even at room temperature. Secondly, there are a variety of derivatives for studying on single molecular transistor. We will study on the electron transport mechanism depending on derivatives when molecule was bridged between nanogap electrodes. For the final step, we will also try to dope a molecule. Depending on the doping material, it is expected to have P or N type of single molecular transistor.
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