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Yoshida Lab
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The lab explores the electronic states of organic semiconductors using its own electron spectroscopy methods.
AboutAbout the lab
Seeing the electrons in organic semiconductors with original electron spectroscopy.
The Yoshida Lab studies the electronic states of organic semiconductors.
Organic semiconductors are next-generation semiconductors that are flexible, lightweight, and low-cost to manufacture, and they are used in thin, high-performance displays and solar cells.
Current control in transistors, light emission in light-emitting devices, and the conversion of light into electricity in solar cells are all driven by electrons.
The lab investigates electronic states with world-leading experimental methods, including low-energy inverse photoelectron spectroscopy, which it developed itself.
Key terms
- Organic semiconductor
- A semiconductor made of carbon-containing molecules. It can be bent, is light, and is inexpensive to produce
- Electron spectroscopy
- A method that irradiates a sample with light or electrons and investigates its electronic states from the energies of the electrons or light that come out or go in
- Molecular orientation
- The direction in which molecules are aligned within a thin film. It affects how easily electric current flows
NewsLab news
A PhD student received the Young Researcher Presentation Award at the international conference M&BE12
A paper on an energy-level alignment model at perovskite solar cell interfaces was published in Journal of Materials Chemistry A
A paper on a method for analyzing low-energy inverse photoelectron spectra was published in Review of Scientific Instruments
A paper on an automatic analysis method for spectroscopic spectra was published in Journal of Electron Spectroscopy and Related Phenomena
ResearchResearch themes
The lab studies the electronic states of organic semiconductors. Electronic states are the most fundamental information determining how a semiconductor works, and the lab regards what a researcher manages to clarify from them as the place where their skill shows.
*Illustrative imageOrganic semiconductors
In solids made up of molecules with widely extended π orbitals, electric current flows through the overlap between orbitals. Holes move through the HOMO and electrons through the LUMO, so the lab examines the energies of these orbitals and how they overlap.
*Illustrative imageElectron spectroscopy
Occupied levels filled with electrons are probed with photoelectron spectroscopy, and unoccupied levels with inverse photoelectron spectroscopy. By developing low-energy inverse photoelectron spectroscopy, the lab made it possible to measure the unoccupied levels of organic semiconductors, which had previously been difficult.
*Illustrative imageThin-film structure and molecular orientation
Organic molecules differ in both shape and molecular orbitals depending on their orientation, so the way they are arranged in a solid greatly changes the electronic states. The lab investigates thin-film structure and molecular orientation using X-ray diffraction, infrared, Raman, and UV-visible spectroscopy, atomic force microscopy, and other methods.
*Illustrative imageLow-energy inverse photoelectron spectroscopy
Conventional inverse photoelectron spectroscopy had the problems that irradiating the sample with electrons damages it and that the resolution is low. The lab developed near-ultraviolet low-energy inverse photoelectron spectroscopy and has gone on to improve the instrument and to carry out angle-resolved measurements.
MembersFaculty
The members of the Yoshida Lab consist of faculty, project researchers, a visiting professor, assistant staff, and PhD, master's, and undergraduate students.As of 2026
- ProfessorHiroyuki Yoshida
- Assistant ProfessorRyotaro Nakazawa
VoicesStudent voices
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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: “SynchrotronLight” Canadian Light Source Inc. / CC BY-SA 2.0 (cropped)
- Organic semiconductors: “Semiconductor Wafer of Microelectronics” DrHughManning / CC BY-SA 4.0 (cropped)
- Electron spectroscopy: “Photoemission laboratory” Food95 / CC BY-SA 4.0 (cropped)
- Thin-film structure and molecular orientation: “AFM-Raman-TERS” AAMonitor96 / CC BY-SA 3.0 (cropped)
- Low-energy inverse photoelectron spectroscopy: “31LK3b electron gun” Mister rf / CC BY-SA 4.0 (cropped)
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- Related lab (宮前・亀山研究室): “TiSa crystal” No machine-readable author provided. Mathieu Perrin assumed (based on copyright claims). / CC BY 2.5 (cropped)
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