Researcher Database

（Last updated : 2020-09-29 17:36:05）　

AOYAGI Yoshinobu

Department / Course Research Organization of Science and Technology

Title / Position Visiting Senior Researcher

Other Affiliations
1.	Research Organization of Science and Technology SR Center

Academic background
1.	1972/03 Degree Acquisition	│ Osaka University Doctor of Engineering
2.	～1965/03	Department of Electrical Engineering │ Faculty of Engineering Science │ Osaka University │ Graduated
3.	～1971/03	Doctorial Course │ Physics │ Graduate School, Division of Engineering Science │ Osaka University
4.	～1965/03	Master's course, Physics │ Graduate School, Division of Engineering Science │ Osaka University │ Completed

Research activities
1.		The Japan Society of Applied Physics
2.		The Physical Society of Japan
3.		The Laser Society of Japan
4.		The Society of Nano Science and Technology
5.		American Institute of Physics (AIP)

Subject of research
1.	Development of High-output Deep-ultraviolet Semiconductor Light Emitting Device and Its Application to Environmental Electronics and Biotechnology
2.	Electrical Control of Neural Information Transmission in Neuron

Research summary
The outlines of my main research subjects are as follows: [Research Subject (1) Outline] The development of a high efficient deep ultraviolet light emission semiconductor element and its application to the environment and biology・・・ I develop a new high efficient deep ultraviolet light emission element that emit light efficiently and powerfully in a deep ultraviolet region from 200nm to 350nm and research its application to water purification, sterilization and biology. Nitride semiconductor is the only semiconductor material that can emit light in the deep ultraviolet region and receives a lot of attention as a material that support the important scientific and technological infrastructure to solve the important social subject in the 21the century such as environment medical care and safety. Although the development of the high power deep ultraviolet light emission elements with the power from 1 watt to 100 watts in particular is an indispensable technology that support the hardware side to solve the problems such as purification of water, class is aimed at future purification of water, decomposition of hardly decomposable materials such as PCB, sterilization to prevent in-hospital infection and other environmental issues in the future, there is not any methodology to increase the power density and no one ha not yet succeeded in increasing power density in the world. The purpose of this research is to send a new concept called "Environmental Electronics" for the first time in the world, establish a new great research group in the interdisciplinary field between the semiconductor electronics and environment studies. Concretely, using the unique 2 beam interferogram crystal growth in situ observation system in the world that we have developed, we investigate the initial process of crystalization, the control of heterointerface and high quality reproducible AlGaN epitaxial crystalization which have been difficult to be researched so far. Particularly, we focus on the research on the hetero structure interface control between nitride semiconductors and metal interface control. In addition, using AlGaN-based materials that are the materials in a ultraviolet region, we establish a technology to create a vertical light emitting device structure that has been impossible to be established so far. We develop a new method to introduce substrate exfoliating layer, succeeded in the technology to exfoliate sapphire substrates and consider the clarification of exfoliation process and a new methodology. Furthermore, we attempt to further improve the quality of AlGaN crystal and obtain high internal quantum efficiency. In particular, we attempt to introduce quantum dots and perform high concentration doping using a co-doping method. In addition, we use these methods to establish a system corresponding environment. We clarify the usefulness of our technologies by actually attempting to apply them to water purification, sterilization, etc.　　 [Research Subject (2) Outline] Electrical control of neurotransmission in neurons・・・ We attempt to electronically control the conveyance of information in the nerves in the method that has not existed so far. No one has not yet succeeded in the electrical control, different from the conventional information transmission method in electronics. If this subject is achieved successfully, a field called New Neuroelectronics is established and various applications and developments to the fields such as the control of pain of body and the local activity awakening are assumed. Our laboratory aims to establish a new information conveyance control method and its applications in cooperation with the biology laboratory. The control method in a single neuron is already proposed by us and proved by the experiments.

Present specialized field
Micro/Nanodevice, Nano Structural Science, Environmental Technology/Environmental Material, Applied Physical Properties/Crystal Engineering, Electronic materials/ Electric materials, Electron device/ Electronic equipment, Thin film/Surface and interfacial physical properties, Inorganic materials/Physical properties, Nano Materials/Nano Bioscience (Keyword：nanoelectronics, environmental electronics, nitride semiconductor, 2-light beam in-situ observation method, quantum dot, alternative co-doping method , vertical deep-ultraviolet-light-emitting semiconductor device, sterilization, water purification, decomposition of refractory molecules, neurotransmitter control, three terminal control)

Books
1.	2012/06	Optical Properties of Advanced Materials │ ,pp.1-38
2.	1994/05	Atomic Layer Epitaxy
3.	1992/03	Microcrystalline Semiconductors: Materials Science and Devices
4.	1991/04	Low Temperature Epitaxial Growth of Semiconductors │ ,pp.199-290
5.	1991/03	Atomic Layer Growth and Processing

Papers
1.	2013	A 2-inch, large-size deep ultraviolet light-emitting device using dynamically controlled micro-plasma-excited AlGaN │ Applied Physics Letters │ 102 (4),pp.041114-1-041114-3
2.	2012/08	Control of neural signal propagation in neuron by three therminal electrodes method │ Elec. Letters │ 48 (18),pp.1093-1095
3.	2012/08	High-sensitivity ozone sensing using 280nm deep ultraviolet light-emitting diode for depletion of natural hazard ozone │ Journal of Environmental Protection │ 3 (8),pp.695-699
4.	2012	Formation of AlGaN and GaN epitxial layer with high p-carrier concentration by pulse supply of source │ AIP Advances │ 2,pp.0012177-0012183
5.	2011	High hole carrier concentration realized by alternative co-doping technique in metal organic chemical vapor deposition │ Appl. Phys. Letters │ 99 (11),pp.112110
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Academic conference presentation
1.	2012/12/04	Large area micro-plasma exited AlGaN deep ultravioket light emitter
2.	2012/12/01	Development of new deep ultra-violet light emitter using micro-plasma excitation of AlGaN and its application
3.	2012/11/19	Development of large area micro-plasma-excited AlGaN deep ultraviolet light device (MIPE) for disinfection of water
4.	2012/10/16	Two inch large area DUV AlGaN light emitter using micro-plasma excitation
5.	2012/07/16	Development of new deep ultra-violet light emitter using micro-plasma excitation of AlGaN and its application
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Acquisition patent
1.		Apparatus for CFC-free laser surface cleaning （US6291796 (B1)）
2.		Charged particle beam apparatus and method of forming electrodes having narrow gap therebetween by using the same （US2006038137 (A1)）
3.		Electron beam-excited ion beam source （US4749910 (A)）
4.		ELECTRONIC DEVICE AND METHOD FOR PRODUCING ELECTRONIC DEVICE （US2009139752 (A1)）
5.		FINE PATTERN FORMING METHOD AND FINE PATTERN FORMING DEVICE （WO2006003921 (A1)）
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