2006 Fiscal Year Final Research Report Summary
CHARATRETIZATION OF FLEXIBLE NANO INTERFACIAL FILM BY MEANS OF MAXWELL DISPLACEMENT CURRENT AND OPTICAL SECOND HARMONIC GENERATION
| Project/Area Number |
15206032
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Electronic materials/Electric materials
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
IWAMOTO Mitsumasa Tokyo Institute of Technology, GRADUATE SCHOOL OF ENGINEERING DEPARTMENT, PROFESSOR, 大学院理工学研究科, 教授 (40143664)
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| Co-Investigator(Kenkyū-buntansha) |
MANAKA Takaaki Tokyo Institute of Technology, GRADUATE SCHOOL OF ENGINEERING DEPARTMENT, ASSISTANT PROFESSOR, 大学院理工学研究科, 助手 (20323800)
周 しん 東京工業大学, 大学院理工学研究科, 準客員研究員
NOGUCHI Yutaka NATIONAL INSTITUTE FOR COMMUNICATION TECHNOLOGY, RESEARCHER, 関西先端研究センター, 研究員 (20399538)
ZHOU Xin Tokyo Institute of Technology, GRADUATE SCHOOL OF ENGINEERING DEPARTMENT, VISITED RESEARCHER
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| Project Period (FY) |
2003 – 2006
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| Keywords | Monolayer / Maxwell displacement current / Optical second harmonic generation / Flexibility / Electro-static phenomena / Nano interface / Organic FET / Domain Pattern |
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| Research Abstract |
The purpose of this investigation was to characterize the linear and nonlinear dielectric properties of organic monolayer films by means of Maxwell-displacement current (MDC) and optical Second Harmonics Generation (SHG) measurement. The macroscopic dielectric properties such as linear and nonlinear dielectric constants are strongly related to the orientational order parameters of the constituent molecules. From this point of view, this investigation has been carried out on the basis of the idea of MDC measurement coupled with SHG measurement, proposed by the investigators.
(1)Interfacial monolayer was treated as a flexible system. Direction of molecules is restricted by the presence of interface, and thus the specific polarizations such as spontaneous polarization and nonlinear polarization are induced. We investigate such polarization to evaluate the flexibility of the system. We can find the relationship between flexibility of films and the electrical property of them.
(2)We used rod-like liquid crystalline molecules, biological molecules, chiral helix molecules and photo-isomers. Langmuir monolayers of these molecules were formed and measure the MDC and SHG. According to the result obtained from the MDC and SHG measurement, we can reveal the geometrical and electronic structure of monolayers. In particular, we successfully reproduce the pattern formation of molecular domains on a water surface.
(3)For organic devices, such as organic field effect transistor and organic electro luminescent devices, we propose novel techniques for evaluating the electric field distribution in the devices and for probing the carrier motion in the devices. Also, we proposed a model which describes the operation of the organic field effect transistors on the basis of Maxwell-Wagner analysis.
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