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Ionization Reaction Engineering Lab
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The lab develops process technologies and advanced devices using plasma and lasers.
AboutAbout the lab
Developing processes and devices with plasma and lasers.
The Ionization Reaction Engineering Lab (Yamagata-Teii Lab) works on process technologies using plasma and lasers, and on the development of advanced devices.
Plasma processes that make use of ionization reactions can produce physical and chemical effects that do not occur in ordinary environments.
The lab works on developing and optimizing processes, analyzing device performance, developing new types of light sources, and developing electronic materials and devices that can be used in harsh environments.
The lab is divided into Associate Professor Yamagata's Discharge/Laser Group and Associate Professor Teii's Electronic Materials EMD Group.
Key terms
- Plasma
- A state in which electrical energy is applied to a gas so that it separates into electrons and ions.
- Raman scattering spectroscopy
- A method in which laser light is directed at a material and properties such as temperature and strain are determined from the scattered light.
- Carbon nanowall
- A carbon structure in which multilayer graphene stands vertically like walls, giving it a sharp-edged surface.
ResearchResearch themes
The Ionization Reaction Engineering Lab develops process technologies and advanced devices using plasma and lasers. Associate Professor Yamagata's Discharge/Laser Group uses laser measurements to understand reactions and analyze devices, while Associate Professor Teii's Electronic Materials EMD Group works on materials and devices such as electron emitters and gas sensors.
*Illustrative imageMeasuring Temperature and Strain in Operating Semiconductors
In nitride semiconductor devices, rising temperature and strain at the junction reduce efficiency and lifetime. The lab aims to establish a method for measuring the two-dimensional distribution of temperature and strain during operation using pulsed-laser Raman scattering spectroscopy.
*Illustrative imageVisualizing Nanomaterials Produced by Lasers
In pulsed laser deposition, atoms and molecules ejected by a laser accumulate on a substrate to form a thin film. Using laser and spectroscopic measurements, the lab visualizes the reactions and the process by which fine particles form, aiming to clarify the mechanisms of their generation and transport.
*Illustrative imageDeveloping High-Performance Electron Emitters
Vacuum microdevices that use field-emission electron emitters are expected to offer high efficiency, low power consumption, and compact size. The lab fabricates composite films in which carbon nanowalls are decorated with metal or diamond particles, and examines their field-emission characteristics to explore design guidelines.
*Illustrative imageDeveloping Highly Sensitive Gas Sensors
There is demand for highly sensitive, fast-responding sensors that detect hydrogen leaks. Carbon nanowalls have a large surface area, and the adsorption of hydrogen and other gases changes how electric current flows through them. The lab optimizes the electrical properties of junctions with metals and explores design guidelines for sensors combined with semiconductor devices.
MembersFaculty
The members of the Ionization Reaction Engineering Lab consist of faculty and doctoral, master's, and undergraduate students.As of 2025
- Associate ProfessorYukihiko Yamagata
- Associate ProfessorKungen Teii
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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: “Minimal Fab exhibit at Tsukuba Science Square 5” Syced / CC0 (cropped)
- Measuring Temperature and Strain in Operating Semiconductors: “COVID-19 rapid test device (2020)” Secretaria Especial de Saúde Indígena (Sesai) / CC BY-SA 2.0 (cropped)
- Visualizing Nanomaterials Produced by Lasers: “Selenium NPs” Muderkind / CC BY 4.0 (cropped)
- Developing High-Performance Electron Emitters: “Cathode surface 1” Pavel.Somov / CC BY 4.0 (cropped)
- Developing Highly Sensitive Gas Sensors: “CMOS image sensor chip-scale package oblique” Phiarc / CC BY-SA 4.0 (cropped)
- Related lab (プロセス設計工学研究室): “Real snowflake macro photo” Alexey Kljatov / CC BY-SA 4.0 (cropped)
- Related lab (先端機能材料研究室): “Hypervelocity impact damage on silica glass” Jasalem21 / CC0 (cropped)
- Related lab (計算材料科学研究室): “Formaldehyde Molecular Orbitals” ChiralJon / CC BY 2.0 (cropped)
- Related lab (電力変換システム工学研究室): “Electric power transformation substation in Iraq” 作者不詳 / Public domain (cropped)
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