NAIST Graduate School of Materials Science

Organic Electronics Laboratory

Staff & Contact
Educational StaffProf. Masakazu Nakamura
Assistant Prof. Hirotaka Kojima
URLhttp://mswebs.naist.jp/LABs/greendevice/index_e.html

1. Research aims

We are carrying out our research projects with the slogan “Electronics on Any Surface!” We take advantage of organic conducting materials in view of the sustainability of society, aiming to add unprecedented electronic functions to all aspects of life, including food, shelter, and clothing. We utilize all our knowledge of solid-state physics, material chemistry, and electronic engineering to advance our research covering everything from basic science to applications.

2. Example of research activities

We have developed various unique equipments including an “atomic-force-microscope potentiometry” that allows us to precisely measure the electric potential distribution on the surface of functional organic materials with very high special resolution (Fig. 1). By combining original evaluation methods and synchrotron radiation beam-based structural analyses, we have clarified the hierarchical crystallographic structure of pentacene thin films, a typical material for organic thin-film transistors, as well as the corresponding carrier transportation band-edge structure (Fig. 2).

3. Educational policy

We determine research themes from a wide range of research fields, from basic studies related to materials to practically operable active elements in circuits, depending on the interests and aptitudes of individual students. In addition, we foster independent thinking and a top-level mindset necessary for researchers through joint research with research institutes home and abroad, as well as presentations at international conferences. Thus, we aim to cultivate researchers who have a broad knowledge of science and a perspective toward industrial applications.

1. Elucidation of carrier transport mechanisms in organic semiconductors.

2. Exploration of organic thermoelectric materials toward the realization of flexible thermoelectric conversion devices.

3. Basic research on flexible THz imaging devices using organic transistor structures.

4. Development of high-brightness organic photovoltaic devices for energy harvesting in room ambient (Fig. 3).

  • Fig.1 Atomic-force-microscope potentiometry apparatus
  • Fig.2 Hierarchical structure of pentacene thin films
  • Fig.3 High-brightness organic photovoltaic device

1. S.-G. Li et al., “Oriented Growth of Pentacene Crystals for Improvement of The Characteristics of OTFTs”, Org. Electron. 13, 864 (2012)

2. S . Yogev et al., “Direct Measurement of Density of States in Pentacene Thin Film Transistors”, Phys. Rev. B 84, 165124 (2011)

3. R. Matsubara et al., “Crystal Order in Pentacene Thin Films Grown on SiO2 and Its Influence on Electronic Band Structure,” Org. Electron. 12, 195 (2011)

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