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Chichibu Lab
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A lab that explores the properties of light-emitting semiconductors, from crystal growth to devices.
AboutAbout the lab
Light-emitting semiconductors, from crystals to devices.
The Chichibu Lab (Quantum Optoelectronics Division) studies the physical properties of wide-bandgap compound semiconductors.
The wide-bandgap compound semiconductors under study are expected to be applied to deep-ultraviolet light-emitting devices and to polariton lasers, which combine the functions of light and excitons.
The lab can carry out everything from crystal growth and processing to prototype device fabrication, and has many instruments for optical characterization.
The lab belongs to the Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, and is a cooperative laboratory of the Department of Applied Physics, Graduate School of Engineering.
Key terms
- Wide-bandgap compound semiconductor
- A semiconductor in which a large amount of energy is needed to put electrons into a mobile state. It supports short-wavelength light.
- Exciton
- A state in which an electron and the hole (the vacancy left by the electron) are bound to each other.
- Polariton laser
- A low-threshold laser that emits light through condensation of polaritons, in which photons and excitons are coupled.
- Deep ultraviolet
- Short-wavelength ultraviolet light in the 200 nm range. It is expected to be applied to sterilization and disinfection.
NewsLab news
Review paper on light emission from boron nitride (BN) published in APEX-NEXT
Received the Best Paper Award at IWJT2025
Paper on point defects and emission properties of AlN crystal layers published in Appl. Phys. Lett.
Paper on defect recovery in gallium nitride published in J. Appl. Phys.
ResearchResearch themes
The lab studies the physical properties of wide-bandgap compound semiconductors, materials expected to be used in applications such as deep-ultraviolet light-emitting devices and polariton lasers. It covers everything from crystal growth to prototype device fabrication, and also performs evaluation by time-resolved and spatially resolved spectroscopy.
*Illustrative imageDeep-ultraviolet light sources for water purification and disinfection
High-efficiency deep-ultraviolet solid-state light sources with wavelengths of 260–280 nm are regarded as one way to contribute to securing safe water. The lab specializes in research on the crystal growth, process technology, and optical and electrical properties of semiconductors for the LEDs and semiconductor lasers used in such sources.
*Illustrative imageHigh-frequency power devices
Replacing the semiconductor material of power transistors, from silicon to GaN and others, is attracting attention. The lab conducts research that contributes to developing large-diameter GaN single-crystal substrates free of warpage and defects, high-purity drift layers with high breakdown voltage, and ion implantation technology.
*Illustrative imageLow-threshold polariton lasers
These are low-threshold coherent light sources that emit light by condensing polaritons, in which photons and excitons are coupled inside a cavity. Operating at room temperature requires a semiconductor whose excitons are stable at room temperature, and ZnO is a material with a large exciton binding energy.
*Illustrative imageGroup III nitride semiconductor materials
The main research subject is the group III nitride semiconductors (B,Al,Ga,In)N. These materials can emit light from optical communication wavelengths down to the deep ultraviolet in the 200 nm range, and have been used in devices such as blue LEDs. Deep-ultraviolet LEDs and other devices extending to AlN and BN are expected in the future.
MembersFaculty
The members of the Chichibu Lab consist of faculty, research staff, research collaborators, and students.As of 2026
- ProfessorShigefusa Chichibu
- Associate ProfessorKohei Shima
- Assistant ProfessorMoriyuki Kanno
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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: “Dr Thaddeus (Tadj) Asel focuses on the growth of oxide semiconductor materials such as Gallium Oxide to address the need for smaller and higher power electronics (8380318)” U.S. Air Force AFRL by Keith C Lewis / Public domain (cropped)
- Deep-ultraviolet light sources for water purification and disinfection: “Ultraviolet LEDs” Maxmust / CC BY-SA 4.0 (cropped)
- High-frequency power devices: “SEG DVD 430 - STP4NC60FP on power unit-3404” Raimond Spekking / CC BY-SA 4.0 (cropped)
- Low-threshold polariton lasers: “Laser reflectors” Tourbillon / CC BY-SA 3.0 (cropped)
- Group III nitride semiconductor materials: “Wafer - 4” Windell Oskay / CC BY 2.0 (cropped)
- Related lab (Okamoto Lab): “Ferromagnetic domains in spiral pattern for Fe60Al40” Magnunor / CC BY-SA 4.0 (cropped)
- Related lab (Ultra-Broadband Communication Infrastructure Lab): “ALMA antenna against cloudy sunset (dv08hrd1-cc)” S. Otarola/ESO / CC BY 4.0 (cropped)
- Related lab (Quantum Device [Otsuka] Lab): “Helium dilution cryostat” User:Wiso / Public domain (cropped)
- Related lab (Saito-Ogawa Lab): “Hard disk drive platter, Western Digital Caviar 250Gb WD2500AAKS” Mk2010 / CC BY 4.0 (cropped)
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