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Electronic Materials Lab
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The lab aims to solve the power problem of the AI era with novel-principle devices that combine light and semiconductors.
AboutAbout the lab
Solving the power problem of the AI era with novel-principle devices combining light and semiconductors
The Electronic Materials Engineering Lab conducts research aimed at solving the power problem of the AI era with novel-principle devices that combine light and semiconductors.
With the spread of generative AI and large-scale data processing, the power consumption of data centers is rising rapidly, and innovation in information-processing hardware itself is needed.
The lab focuses on the exciton transistor, which aims to achieve E-O conversion, the conversion of electrical signals into optical signals, within a transistor structure.
Toward the practical use of exciton transistors, the lab advances research and development at three levels: materials, processes, and devices.
Key terms
- Exciton
- A particle formed by pairing an electron and a hole. Its transport can be controlled by an electric field, and it interacts strongly with light.
- Optical interconnect
- A method of transmitting signals with light instead of electrical wiring. It has no RC delay and incurs no power consumption from charging and discharging the capacitance between wires.
- E-O conversion
- The conversion of electrical signals into optical signals that links electronic devices with optical interconnects. Current devices consume relatively large amounts of power.
NewsLab news
A student won the Student Award at ISSP 2026
Research results were published in ACS Omega
A master's student won the Student Presentation Encouragement Award at the Academic Meeting of the Kyushu Branch of the Japan Society of Vacuum and Surface Science
A student won the Kyushu Branch Chair's Award of the Institute of Electrical Engineers of Japan
A student won the Presentation Encouragement Award at the JSAP Kyushu Chapter Annual Meeting 2025
ResearchResearch themes
Electrical wiring is the mainstream for short-distance transmission inside computers, but optical interconnects are attracting renewed attention. A challenge in E-O conversion, which links optical interconnects with electronic devices, is that current devices consume relatively large amounts of power. This lab studies novel-principle devices such as the exciton transistor, aiming to build the academic foundation for information-processing technologies that support an AI and low-carbon society.
*Illustrative imageElectrical-to-optical conversion with exciton transistors
Using excitons as carriers, whose transport can be controlled by an electric field and which interact strongly with light, the lab aims to achieve E-O conversion in a transistor structure. It advances research and development at three levels: materials, processes, and devices.
*Illustrative imageMemory development and hydrogen production by photocatalysis
The lab is proposing exciton-based optical memory aimed at overcoming the von Neumann bottleneck, and developing non-volatile memory for AI. It is also developing green hydrogen production technology using semiconductor-based visible-light photocatalysts, with an eye on the growing power demand of the AI era.
MembersFaculty
The lab's members consist of faculty, technicians, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorNaho Itagaki
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Propagation of light through the core of an optical fiber, Macro visualization, Demonstration of prof Angel Toshkov to students.” AZToshkov / CC BY-SA 3.0 (cropped)
- Electrical-to-optical conversion with exciton transistors: “Electro-optic-phase-modulator” Geek3 / CC BY-SA 4.0 (cropped)
- Memory development and hydrogen production by photocatalysis: “Hydrogen” Joe DeMare / CC0 (cropped)
- Related lab (Electron Spin Physics and Engineering Lab): “Magnetic Semiconductor ( )” National Institute of Standards and Technology / Public domain (cropped)
- Related lab (Constructive Electronics Lab): “Neuromorphic Nanowire Network” DrHughManning / CC BY-SA 4.0 (cropped)
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