Oxygen Stability and Leakage Current Properties of La-Modified Bismuth Titanate Ferroelectric Thin Films
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概要
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The effects of oxygen annealing on the structural properties and leakage current behaviors of sol–gel-derived Bi3.25La0.75Ti3O12-y ferroelectric thin films have been studied. The thin films were pyrolyzed in different atmospheric conditions including a fully oxygenized ambient of 1 bar and an evacuated ambient of less than 10 mbar. X-ray diffraction patterns of the deoxygenated films showed measurable shifts to a higher angle, indicating that each deoxygenated film had a smaller lattice constant than the oxygenated one. Scanning probe analysis showed well-developed grains and inhomogeneous and asymmetric bound charges in both samples. The leakage current behavior of the films was measured as a function of voltage and temperature and was explained on the basis of the Schottky–Simmons thermionic emission model. X-ray photoemission spectra showed that oxygen stability in Bi2O2 layers plays an important role in determining the level of leakage current in the films.
- 2009-11-25
著者
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Jo William
Department Of Physics Ewha Womans University
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Kim Dae
Department Of Anatomy And Center For Advanced Medical Education By Bk21 Project Inha University Coll
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Lee Ji
Department Of Advanced Materials Science And Engineering Sungkyunkwan University
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Kang Jeongsoo
Department Of Physics The Catholic University Of Korea
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Lee Hyun
Department Of Anesthesia And Pain Medicine School Of Medicine Pusan National University
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Park Chan
Department Of Anatomy College Of Medicine Kyung Hee University
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Shin Ran
Department of Physics, Ewha Womans University, Seoul 120-750, Korea
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Kim Gracia
Department of Physics, Ewha Womans University, Seoul 120-750, Korea
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Park Chan
Department of Materials Science and Engineering, Seoul National University, Seoul 157-542, Korea
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Jo William
Department of Physics, Ewha Womans University, Seoul 120-750, Korea
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Lee Hyun
Department of Physics, The Catholic University of Korea (CUK), Bucheon 420-743, Korea
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Kwon O-Jong
Department of Materials Science and Engineering, Seoul National University, Seoul 157-542, Korea
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Kim Dae
Department of Physics, The Catholic University of Korea (CUK), Bucheon 420-743, Korea
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Kang Jeongsoo
Department of Physics, The Catholic University of Korea (CUK), Bucheon 420-743, Korea
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