Compound Semiconductor Device
Group Outline and Primary Goal
We promote research and development on innovative photonic and electronic devices made
of compound and organic semiconductors, as represented by light-emitting devices, detectors, and optical
modulation devices. Those devices are developed by utilizing unique physical phenomenon in semiconductor
microstructures that are created by highly-sophisticated crystal growth technology such as MBE and MOCVD, and
also by microfabrication technology in the micro- and nano-scale.
Our ultimate goal is that we contribute to create an environment-friendly advanced information society by
generating research and development of the cutting-edge semiconductor technology.
Key Themes of Research
1) Research and development of green/yellow semiconductor lasers made of group II-VI compound
semiconductors.
2) Research and development of
high-efficiency and high-directionality light-emitting diodes based on the evanescent
wave coupling effect in a small ridge or truncated-cone structure.
3) Compact and high power (quick charging) wireless power transfer (WPT) technology using GaN electronic device
![](image/group/opsd_6.jpg)
Schematic of a semiconductor laser
![](image/group/opsd_7.png)
Photograph and spectra showing the continuous wave operation at room temperature of a BeZnCdSe quantum-well semiconductor laser
![](image/group/opsd_2.png)
SEM image of the small truncated cones fabricated on the surface of a GaN blue LED
![](image/group/opsd_5.jpg)
Comparison of the light output intensity of a truncated-cone type LED with
that of a flat-surface device.
3) Compact and high power (quick charging) wireless power transfer (WPT) technology using GaN electronic device
![](image/group/opsd8.png)
Demonstration of GaN-WPT using a drone
Our Technologies and Equipment
- MBE crystal growth technology of group III-V and II-VI compound semiconductors
- MOCVD crystal growth technology of group III-V compound semiconductors
- Fabrication and characterization technology of semiconductor lasers and light-emitting diodes
- Fabrication and characterization technology of organic semiconductor thin films.
- Physical property characterization technology, such as photoluminescence, time- and spatial-resolved photoluminescence
- High-speed WPT technology and high-performance compact power-conversion circuit.