Intelligent Materials Science Laboratory (with SHARP Corporation)
|Staff & Contact|
|Educational Staff||Visiting Prof. Makoto Izumi
Visiting Associate Prof. Noboru Iwata
Education and Research Activities in the Laboratory
The Intelligent Materials Science Laboratory has three faculty members who independently conduct research on new devices and materials in their own specialized fields, including research on power management system technology, nano-sized materials such as Quantum dot compound semiconductors for light emitting diodes (LEDs) or new-type photovoltaic, and p-type oxide for transparent and flexible TFTs.
1. Power management system technology
The issues concerning the global environment and fossil fuel exhaustion have been promoting requirements for energy saving and the usage of natural energies such as photovoltaic generation. To contribute these social demands, we study intelligent power supply units with novel circuits/devices and control architecture for high energy-conversion efficiency and highly reliable operation with various power sources including solar power.
2. Nano-sized materials
Electronic characteristics of semiconducting materials are entirely different from bulk materials due to quantum effects when crystal structures are controlled in a microscopic region ranging from atomic to several nanometers in size. We are studying functional materials that can sensitively show macroscopic responses to external stimuli such as light, electric fields, and magnetic fields through controlling electronic level or phase transition.
3. Oxide semiconductors
Flexible semiconductor devices are widely expected for future displays, photovoltaics, and sensors. We are studying thin film amorphous oxide semiconductors with high carrier mobility based on the physical vapor deposition (PVD) method. The main topics here are the creation of transparent p-type semiconductors and investigations of organic-inorganic hybrid p-n junctions.
Explanatory Pictures of Research Activities
- 1. Organic vacuum deposition apparatus (Fig. 1)
- Fig.2 Analytical equipments for power management system
Recent Research Papers and Achievements
1. Signal equalization and reproduction from amplitude information through the use of the frequency response of an optical disc system
・T. Okumura, T. Numata, J. Akiyama, S. Maeda, T. Yamaguchi, A. Takahashi, “Method for Evaluating Partial Response Maximum Likelihood System Performance Using Sequenced Amplitude Margin,” Jpn. J. Appl. Phys. Vol.41, pp.1783-1784 (2002)
2. Super-resolution reproduction through the use of changes in optical characteristics due to temperature at the absorption edge of zinc oxide
・M. Yamamoto, G. Mori, H. Tajima, N. Takamori, A. Takahashi, “Super-Resolution Optical Disc with High Readout Stability Using Zinc Oxide Thin Film,” Jpn. J. Appl. Phys. Vol.43, pp.4959-4963 (2004)