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Physical Chemistry of Materials Lab
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The lab uses microwaves to measure, without contact, how easily electricity flows, in search of new semiconductors.
AboutAbout the lab
Measuring charge motion without touching it.
The Physical Chemistry of Materials Lab (Seki Lab) is developing the time-resolved microwave conductivity (TRMC) method, which uses microwaves to measure the charge mobility of semiconductor materials quickly, in a non-contact, non-destructive way.
The lab is extending this method to measurements at semiconductor-insulator interfaces and under high pressure, and also works on designing organic semiconductor materials with a focus on molecular shape and on creating nanowires using ion beams.
Key terms
- Charge mobility
- An index of how fast electrons or holes move when a voltage is applied
- Microwave
- A long-wavelength electromagnetic wave, also used in microwave ovens
- Nanowire
- A very thin wire with a thickness on the order of nanometers (one nanometer is one billionth of a meter)
ResearchResearch themes
The lab develops methods for measuring charge transport with electromagnetic waves and microwaves, and creates new organic semiconductor materials and nanomaterials.
*Illustrative imageRapid characterization of materials with microwaves
The lab develops the TRMC method, which uses microwaves to measure charge mobility, the property that determines semiconductor performance, in a non-contact, non-destructive way and at overwhelming speed. It accurately measures even materials whose true properties could not be captured before.
*Illustrative imageCharge transport at semiconductor-insulator interfaces
The lab placed a device consisting of an electrode, an insulator, and a semiconductor in a cavity resonator and developed an apparatus that uses microwaves to capture only the charge motion at the interface. It has succeeded in observing charge accumulating in response to voltage.
*Illustrative imageOrganic semiconductors focused on molecular shape
The lab aims for new functions by using unusual molecular skeletons. With a 'shish-kebab-type' polymer in which disk-shaped molecules are strung in a line, it aligned electron donors and acceptors and found a material that shows high photoconductivity.
*Illustrative imageMaking nanowires with ion beams
The lab has established the single particle nanofabrication technique (SPNT), in which accelerated ions are fired at a polymer thin film and only the portion along each ion's path is crosslinked, forming uniform polymer nanowires. It uses this technique to create functional nanomaterials.
MembersFaculty
- ProfessorShu Seki
- Associate ProfessorTakayuki Tanaka
- Assistant ProfessorYusuke Tsutsui
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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: “Magnetron detail” Schrauber5 / CC BY-SA 4.0 (cropped)
- Rapid characterization of materials with microwaves: “Reflex klystrons and microwave cavities” 作者不詳 / Public domain (cropped)
- Charge transport at semiconductor-insulator interfaces: “OfetEng” Materialscientist / CC BY-SA 3.0 (cropped)
- Organic semiconductors focused on molecular shape: “Mesogen illustration 2” Own work / Public domain (cropped)
- Making nanowires with ion beams: “Perforated microwells” Pavel Apel, JINR Dubna / CC BY-SA 3.0 (cropped)
- Related lab (反応工学): “Toyota Mirai fuel cell stack and hydrogen tank SAO” Mariordo (Mario Roberto Durán Ortiz) / CC BY-SA 4.0 (cropped)
- Related lab (触媒有機化学): “Catalyst nanoparticles” Luca Silvioli / CC BY-SA 4.0 (cropped)
- Related lab (材料解析化学): “Moseley Hall Chemistry Lab” Mbrickn / CC BY-SA 4.0 (cropped)
- Related lab (機能性材料化学): “Ionic liquid anti-wear additive ( )” Oak Ridge National Laboratory / CC BY 2.0 (cropped)
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