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 *Three dimensional nano structure assembling and its application to future devices. Mission in this research team is manufacturing three dimensional nano structures composed of compound semiconductors and organic materials by ion beam assisted reaction or by self-organization. The focused ion beam enables a nano space reaction due to the energy transfer to nano regions, Ieading to the three dimensional micro crystal growth. Ordered nano structures can be configured by scanning the ion beam. GaN based nano semiconductor materials can be grown on Si substrate using this method,. Organic materials have characteristic bonds and atomic structure arrangements. Combinations of organic materials bring unique properties which are attractive for the future electron devices. For this purpose, various types of organic materials are assembled to realize property. A combinatorial methodology is employed to find the material and to optimize the structure. With the combination of the combinatorial synthesis and material discovery system, the three dimensional nano structures with unique characters are expected to be proposed. *Nano-structure formation based on surface local potential Our research plan for nano-structure formation is based on the combination of utilization of inherent properties of materials with a trigger such as the irradiation of ions, molecules, or electrons. Surface segregation is one of inherent surface properties of multi-component materials. The general method to predict segregation phenomenon of substrate element on a film has been established. At present, epitaxial growth of ultra-thin Al2O3 film for metal-insulator-metal tunneling electron emitter is studied using oxygen induced Al segregation. The photo shows the low energy electron diffraction from Al2O3 film grown on Cu-9Al(111). The effect of oxygen introduction conditions during epitaxial growth process on the crystalinity of the film was evaluated. The measurement and interpretation of local work function are of our interest from a viewpoint of reaction with molecules on nano-structured surface. |
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