The dynamics of photogenerated electrons and holes in undoped anatase TiO2 were studied by femtosecond absorption spectroscopy from the visible to mid-infrared region (0.1–2.0 eV). The transient absorption spectra exhibited clear metallic responses, which were well reproduced by a simple Drude model. No mid-gap absorptions originating from photocarrier localization were observed. The reduced optical mass of the photocarriers obtained from the Drude-model analysis is comparable to theoretically expected one. These results demonstrate that both photogenerated holes and electrons act as mobile carriers in anatase TiO2. We also discuss scattering and recombination dynamics of photogenerated electrons and holes on the basis of the time dependence of absorption changes.
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7 February 2014
Research Article|
February 06 2014
Photocarrier dynamics in anatase TiO2 investigated by pump-probe absorption spectroscopy
H. Matsuzaki;
H. Matsuzaki
1
Department of Advanced Materials Science, University of Tokyo
, Kashiwa, Chiba 277-8561, Japan
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Y. Matsui;
Y. Matsui
1
Department of Advanced Materials Science, University of Tokyo
, Kashiwa, Chiba 277-8561, Japan
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R. Uchida;
R. Uchida
1
Department of Advanced Materials Science, University of Tokyo
, Kashiwa, Chiba 277-8561, Japan
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H. Yada;
H. Yada
1
Department of Advanced Materials Science, University of Tokyo
, Kashiwa, Chiba 277-8561, Japan
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T. Terashige;
T. Terashige
1
Department of Advanced Materials Science, University of Tokyo
, Kashiwa, Chiba 277-8561, Japan
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B.-S. Li;
B.-S. Li
1
Department of Advanced Materials Science, University of Tokyo
, Kashiwa, Chiba 277-8561, Japan
2
Academy of Fundamental and Interdisciplinary Sciences, Harbin Institute of Technology (HIT)
, Harbin City 150080, China
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A. Sawa;
A. Sawa
3
National Institute of Advanced Industrial Science and Technology (AIST)
, Tsukuba, Ibaraki 305-8562, Japan
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M. Kawasaki;
M. Kawasaki
4
Department of Applied Physics and Quantum Phase Electronics Center (QPEC), University of Tokyo
, Bunkyo-ku, Tokyo 113-8656, Japan
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Y. Tokura;
Y. Tokura
3
National Institute of Advanced Industrial Science and Technology (AIST)
, Tsukuba, Ibaraki 305-8562, Japan
4
Department of Applied Physics and Quantum Phase Electronics Center (QPEC), University of Tokyo
, Bunkyo-ku, Tokyo 113-8656, Japan
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H. Okamoto
H. Okamoto
b)
1
Department of Advanced Materials Science, University of Tokyo
, Kashiwa, Chiba 277-8561, Japan
5
CREST, Japan Science and Technology Agency
, Chiyoda-ku, Tokyo 102-0075, Japan
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a)
Present address: Research Institute of Instrumentation Frontier, National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki 305-8568, Japan
b)
Authors to whom correspondence should be addressed. Electronic addresses: hiroyuki-matsuzaki@aist.go.jp and okamotoh@k.u-tokyo.ac.jp
J. Appl. Phys. 115, 053514 (2014)
Article history
Received:
December 22 2013
Accepted:
January 23 2014
Citation
H. Matsuzaki, Y. Matsui, R. Uchida, H. Yada, T. Terashige, B.-S. Li, A. Sawa, M. Kawasaki, Y. Tokura, H. Okamoto; Photocarrier dynamics in anatase TiO2 investigated by pump-probe absorption spectroscopy. J. Appl. Phys. 7 February 2014; 115 (5): 053514. https://doi.org/10.1063/1.4864219
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