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Hasegawa Lab
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The lab develops materials technologies that make it possible to print devices from organic semiconductors and similar materials.
AboutAbout the lab
Controlling molecular arrangement to create new device functions
The Hasegawa Lab studies the properties of materials made of molecules, such as organic semiconductors and molecular ferroelectrics, and how to use them in devices.
Aiming at flexible electronics, the lab develops foundational technologies for turning organic semiconductors, organic conductors, and ferroelectrics into devices by printing.
The lab aims to control the complex structures that form when molecules self-assemble, and to bring out both the properties unique to molecular materials and new device functions.
Key terms
- Flexible electronics
- Electronic devices and circuits built on thin, soft substrates that can be bent or rolled up
- Organic semiconductor
- A semiconductor made of molecules with a carbon backbone. It can be dissolved in a solution and coated or printed to form films.
- Ferroelectric
- A material with internal electrical polarization whose direction can be reversed by applying an external electric field
NewsLab news
Developed a self-folding monolayer jointly with RIKEN and other institutions
Published a paper on short-channel effects in organic transistors with highly steep switching
Assistant Professor Kiyoshi Nikaido received the Young Scientist Presentation Award from the Japan Society of Applied Physics
Discovered supramolecular layered structures formed by organic semiconductor molecules with different symmetries
ResearchResearch themes
The lab aims to freely control the structure of materials made of molecules, such as organic semiconductors and molecular ferroelectrics, and to bring out properties unique to molecules and new device functions. Covering everything from sample preparation to device design and evaluation of physical properties, the lab explores the fundamentals of materials science that lead to applications.
*Illustrative imageOrganic transistors with steep switching
The lab studies organic thin-film transistors that show steeper switching than inorganic materials. It investigates why current flows well at the interfaces where the semiconductor, metal, and insulator meet, which are key to this behavior, and how to control those interfaces.
*Illustrative imagePredicting organic crystal structures by calculation
The performance of organic semiconductors varies greatly with how the molecules are arranged in the crystal. Focusing on the symmetry specific to layered crystals, the lab develops a method that predicts crystal structures step by step from precise calculations of intermolecular forces.
*Illustrative imageControlling molecular order with liquid crystals
Many organic semiconductors enter a liquid crystal state, intermediate between crystal and liquid, at high temperatures or in solution. The lab aims to understand these phase transitions from a thermodynamic perspective and to use the liquid crystal state to control crystal structure.
*Illustrative imageVisualizing polarization domains in ferroelectrics
The lab grows thin-film crystals of molecular ferroelectrics from solution and has used optical imaging to reveal the shapes of domains, the regions in which the polarization points in the same direction. It also analyzes how the polarization switches under an electric field.
MembersFaculty
The members of the Hasegawa Lab include faculty, senior researchers, secretarial staff, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorTatsuo HasegawaPublications ↗
- Assistant ProfessorKiyoshi NikaidoPublications ↗
VoicesStudent voices
Compiled from answers by students who were in the lab. Ratings and reviews reflect individual students' experiences, not the lab's official views.
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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: “Printed flexible electronics ( )” Oak Ridge National Laboratory / CC BY 2.0 (cropped)
- Organic transistors with steep switching: “Dinaphthylene-dioxide-3D-balls” Jynto and Ben Mills / Public domain (cropped)
- Predicting organic crystal structures by calculation: “Naphthalene-xtal-3D-vdW-A” Ben Mills / Public domain (cropped)
- Controlling molecular order with liquid crystals: “Fächertextur” Minutemen / CC BY-SA 3.0 (cropped)
- Visualizing polarization domains in ferroelectrics: “Ferroelectric domains at a PZT grain boundary ( )” Oak Ridge National Laboratory / CC BY 2.0 (cropped)
- Related lab (井手上
研究室): “Graphen” AlexanderAlUS / CC BY-SA 3.0 (cropped) - Related lab (川崎研究室): “PLD Plume” H.Perowne / CC BY-SA 3.0 (cropped)
- Related lab (米田淳研究室): “Dilution Fridge 009 8K” OJB Quantum / CC BY 4.0 (cropped)
- Related lab (島﨑研究室): “Monolayer TMDC structure” 3113Ian / CC BY-SA 3.0 (cropped)
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