2013 Fiscal Year Final Research Report
Study of photo-induced electron transport phenomena on oxide semiconductor surfaces
| Project/Area Number |
23560020
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Thin film/Surface and interfacial physical properties
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| Research Institution | The University of Tokyo |
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Principal Investigator |
MATSUDA Iwao 東京大学, 物性研究所, 准教授 (00343103)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAMOTO Susumu 東京大学, 物性研究所, 助教 (50554705)
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| Co-Investigator(Renkei-kenkyūsha) |
YOSHINOBU Jun 東京大学, 物性研究所, 教授 (50202403)
D'ANGELO M. Institut des Nanosciences de Paris, Universite Pierre et Marie Curie-Paris 6, Professor
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| Project Period (FY) |
2011 – 2013
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| Keywords | 酸化物半導体 / 光電子分光 / キャリアダイナミクス / 光起電力 / 光触媒 |
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| Research Abstract |
We studied electronic structure and carrier dynamics of oxide semiconductor surfaces that are significant in applied chemistry of photocatalysis and in physics of strongly correlated electronic system. Experiments were carried out with high-resolution angle-resolved photoemission spectroscopy and newly developed time-resolved photoemission spectroscopy at SPring-8 BL07LSU.Surfaces of SrTiO3 and ZnO crystals are metalized with quite strong electron correlation by adsorbing hydrogen atoms and introducing surface defects.
The carrier dynamics was studied by tracking relaxation of the surface photovoltage in real time. For the photocatalysts of TiO2 nanoparticles, chemical reactivity has been reported better on the anatase-type crystal than on the rutile-type. The photo-excited carriers were found to have 10 times longer lifetime on the anatase-type than on the rutile type, as evaluated from the experimentally determined time constants from the two crystal surfaces.
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[Journal Article] Observing hot car r ier distr ibution in an n-type epitaxial gr aphene on a SiC substrate2014
Author(s)
T. Someya, H. Fukidome, Y. Ishida, R. Yoshida, T. Iimori, R. Yukawa, K. Akikubo, S. Yamamoto, S. Yamamoto, T. Yamamoto, T. Kanai, K. Funakubo, M. Suemitsu, J. Itatani, F. Komori, S. Shin, and I. Matsuda
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Journal Title
Appl. Phys. Lett.
Volume: 104
Pages: 161103-1,-4
DOI
Peer Reviewed
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[Journal Article] Relaxations of the surface photovoltage effect on the atomically controlled semiconductor sur faces studied by time-resolved photoemission spectroscopy2013
Author(s)
M. Ogawa, S. Yamamoto, K. Fujikawa, R. Hobara, R. Yukawa, Sh. Yamamoto, S. Kitagawa, D. Pierucci, M.G. Silly, C.-H. Lin, R.-Y. Liu, H. Daimon, F. Sirotti, S.-J. Tang, and I. Matsuda
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Journal Title
Phys. Rev. B
Volume: 88
Pages: 165313-1,-9
DOI
Peer Reviewed
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[Journal Article] Development of soft X-ray time-resolved photoemission spectroscopy system with a two-dimensional angle-resolved time-of-flight analyzer at SPr ing-8 BL07LSU2012
Author(s)
M. Ogawa, S. Yamamoto, Y. Kousa, F. Nakamura, R. Yukawa, A. Fukushima, A. Harasawa, H. Kondo, Y. Tanaka, A. Kakizaki, and I. Matsuda
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Journal Title
Rev. Sci. Instrum.
Volume: 83
Pages: 023109-1, 023109-7
DOI
Peer Reviewed
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[Journal Article] Elucidation of Rh-induced in-gap states of Rh : Sr TiO3 visible-light-dr iven photocatalyst by soft x-r ay spectroscopy and fir st-pr inciples calculations2012
Author(s)
S. Kawasaki, K. Akagi, K. Nakatsuji, S. Yamamoto, I. Matsuda, Y. Harada, J. Yoshinobu, F. Komori, R. Takahashi, M. Lippmaa, C. Sakai, H. Niwa, M. Oshima, K. Iwashina, A. Kudo
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Journal Title
J. Phys. Chem. C
Volume: 116
Pages: 24445-24448
DOI
Peer Reviewed
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[Journal Article] Controlling the topology of Fer mi sur faces in metal nanofilms2012
Author(s)
M. Ogawa, A. Gray, P. M. Sheverdyaeva, P. Moras, H. Hong, L. C. Huang, S. Jung Tang, K. Kobayashi, C. Carbone, T.-C. Chiang, and I. Matsuda
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Journal Title
Phys. Rev. Lett.
Volume: 109
Pages: 026802-1, 026802-4
DOI
Peer Reviewed
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