Electric-Field-Induced Polarization Enhancement of Vinylidene Fluoride/Trifluoroethylene Copolymer Ultrathin Films
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概要
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We investigated the polarization enhancement in 60-nm-thick vinylidene fluoride/trifluoroethylene (VDF/TrFE) films without thermal annealing by applying repeated bipolar electric pulses. The remnant polarization was 8.4 mC/m2 in as-spin-coated films and increased to up to 45 mC/m2 when $10^{5}$ pulses were applied. Although the remnant polarization was half and the coercive field twice those of annealed films, the electrically treated film had a markedly smoother surface than the annealed film. Finally, a 15-nm-thick ferroelectric VDF/TrFE film with low conductivity was fabricated by electric treatment; annealed films with the same thickness experienced a severe short-circuit problem originating from the surface roughness.
- 2011-07-25
著者
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Okamura Soichiro
Department Of Applied Physics Faculty Of Science Science University Of Tokyo
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Nakajima Takashi
Department Network And Computer Engineering School Of Information And Design Engineering Tokai Unive
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MABUCHI Yuichiro
Department of Applied Physics, Faculty of Science, Tokyo University of Science
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FURUKAWA Takeo
Kobayasi Institute of Physical Research
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