Photoreduction of Amorphous and Crystalline ZnO Films(Surfaces, Interfaces, and Films)
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概要
- 論文の詳細を見る
Ultraviolet illumination with photon energy above 4.9eV resulted in photodarkening on sol-gel-derived amorphous ZnO films. Photoreduction of ZnO to Zn metal was achieved by irradiation with energetic photons above 6.7eV. These changes basically originated from the photo-induced charge transfer from O^<2-> to Zn^<2+> in the amorphous structure. The photodarkening is ascribed to an increase in absorption in the visible region due to intermediate ionic states between the lattice oxygen and the dissociated oxygen. The formation of Zn metal was accompanied by desorption of oxygen atoms from the ZnO lattice stimulated through two-electron excitation by the energetic photons. The desorption of oxygen atoms was also observed at the surface of crystalline ZnO films. The photo-induced defective sites were highly reactive and transformed into OH groups by subsequent reaction with water molecules in air.
- 社団法人応用物理学会の論文
- 2002-06-15
著者
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Imai Hiroaki
Department Of Applied Chemistry Faculty Of Science And Technology Keio University
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Awazu Koichi
National Institute Of Advanced Industrial Science And Technology
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HIRASHIMA Hiroshi
Department of Applied Chemistry, Keio University
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ASAKUMA Naoko
Department of Applied Chemistry, Faculty of Science and Technology, Keio University
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FUKUI Toshimi
Kansai Research Institute
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TOKI Motoyuki
Kansai Research Institute
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Asakuma Naoko
Department Of Applied Chemistry Faculty Of Science And Technology Keio University
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Hirashima H
Department Of Applied Chemistry Faculty Of Science And Technology Keio University
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Hirashima Hiroshi
Department Of Applied Chemistry Keio University
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