T
Takafumi Yao
Researcher at Tohoku University
Publications - 591
Citations - 14672
Takafumi Yao is an academic researcher from Tohoku University. The author has contributed to research in topics: Molecular beam epitaxy & Photoluminescence. The author has an hindex of 49, co-authored 591 publications receiving 14287 citations. Previous affiliations of Takafumi Yao include National Institute of Advanced Industrial Science and Technology.
Papers
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Dependence of defect generation and structure on interface chemistry in ZnSe/GaAs
TL;DR: In this paper, the formation of Zn-As and Ga 2 Se 3-like interfacial layers is suggested by transmission electron microscopy in ZnSe films grown on Znexposed GaAs-(2 X 4) and Se-exposed GAAs-(4 X 6) surfaces, respectively.
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Strain effects in ZnO layers deposited on 6H-SiC
TL;DR: In this paper, a correlation in crystallite sizes and defects of epitaxial ZnO layers deposited on 6H-SiC substrates has been addressed, where the misfit dislocations were observed in nucleation and the columnar growth mode diffracted in transmission electron microscopy.
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ZnO quantum pyramids grown on c-plane sapphire by plasma-assisted molecular beam epitaxy
TL;DR: ZnO quantum disks are found to form on the top surface of a thick ZnO epilayer as a result of a morphology transition occurring during the growth of single-crystal thin films on c-plane sapphire using plasma-assisted molecular beam epitaxy as mentioned in this paper.
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X-ray photoelectron spectroscopy study on the CrN surface grown on sapphire substrate to control the polarity of ZnO by plasma-assisted molecular beam epitaxy
Jiho Chang,Mina Jung,Jinsub Park,Seunghwan Park,I.H. Im,Hyunjae Lee,Jun-Seok Ha,Katsushi Fujii,Takashi Hanada,Takafumi Yao,Yasukazu Murakami,Naofumi Ohtsu,Gyung-Suk Kil +12 more
TL;DR: In this article, the polarity selection procedure of ZnO grown on CrN buffer by using X-ray photoelectron spectroscopy (XPS) was studied.
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Localization of the excitonic luminescence of ZnO nano-tetrapods
Mina Jung,Seunghwan Park,S.Y. Ha,Seungjun Oh,Young-Rae Cho,Jinsub Park,I.H. Im,Bon Heun Koo,Takafumi Yao,Jiho Chang +9 more
TL;DR: In this article, low temperature, power dependence, and temperature dependence of ZnO nano-tetrapods were investigated, which strongly indicates that evaluation of luminescence properties of nanostructures requires special care about the localization centers for excitons.