Local Structure around Dopant Site in Ga-Doped ZnO from Extended X-ray Absorption Fine Structure Measurements
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概要
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The local structure around dopant sites in Ga-doped ZnO (GZO) films has been compared with that of Zn sites by means of X-ray absorption fine structure (XAFS) measurements. The near-edge part of XAFS (XANES) showed that the Ga3+ ions occupied the Zn sites substitutionally in GZO. It was found, from the analysis of the extended part of XAFS (EXAFS), that the first nearest Ga--O distances were shorter than Zn--O distances, which is consistent with Ga3+ having a smaller ionic radius than Zn2+. The next nearest Ga--Zn distances were found, on the contrary, to be longer than Zn--Zn distances. This agrees with the behavior of the lattice constants of GZO, which increase with Ga concentration. We argue that these behaviors are the result of a Coulomb interaction originating from the excess charge at the dopant Ga site, which does not arise in nonpolar solid solutions.
- 2011-07-15
著者
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Shibata Hajime
Nanoelectronics Research Institute (neri) National Institute Of Advanced Industrial Science And Tech
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Yamada Akimasa
Research Center for Photovoltaics, AIST, Tsukuba, Ibaraki 305-8568, Japan
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Tampo Hitoshi
Research Center for Photovoltaics, AIST, Tsukuba, Ibaraki 305-8568, Japan
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Yamaguchi Hirotaka
Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
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Maejima Keigou
Research Center for Photovoltaics, AIST, Tsukuba, Ibaraki 305-8568, Japan
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Matsubara Kohji
Research Center for Photovoltaics, AIST, Tsukuba, Ibaraki 305-8568, Japan
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Niki Shigeru
Research Center for Photovoltaics, AIST, Tsukuba, Ibaraki 305-8568, Japan
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Shibata Hajime
Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
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Yamada Akimasa
Research Center for Photovoltaic Technologies, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
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Niki Shigeru
Research Center for Photovoltaic Technologies, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
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