Members
Professor
Shigefusa Chichibu
Assistant Professor
Kohei Shima
Keywords
  • Wide bandgap semiconductors
  • Quantum nanostructures
  • Carrier dynamics
  • Spatio-time-resolved spectroscopy

Major Grad.Sch. of Engineering
Web Site http://www2.tagen.tohoku.ac.jp/lab/chichibu/html/index-j.html

Design and creation of wide bandgap semiconductor quantum nanostructures and spatiotime-resolved spectroscopy

Research objectives of the laboratory are to design and create quantum nanostructures desirable for new functional optoelectronic devices workable in deep ultraviolet, visible, and optical communication wavelengths using planetconscious wide bandgap semiconductors, namely (Al,In,Ga)N and (Mg,Zn)O systems. We are growing quantum structures by metalorganic vapor phase epitaxy and unique helicon-wave-excited-plasma sputtering epitaxy methods. Ultrafast recombination dynamics of excited particles in nanostructures are studied by time-resolved spectroscopy using a femtosecond laser, and very local carrier dynamics are proved by focused pulsed electron beams using a homemade, spatio-time-resolved cathodoluminescence system equipped with a photoelectron-gun.

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