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Ferroelectric and switching behavior of poly(vinylidene fluoride-trifluoroethylene) copolymer ultrathin films with polypyrrole interface

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5 Author(s)
Xu, Haisheng ; Department of Physics, East China University of Science and Technology, Shanghai 200237, China ; Zhong, Juhua ; Liu, Xiaobing ; Chen, Jianhua
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Thin polypyrrole-poly(styrene sulfonate) acid film is employed as interface layers between both bottom and top metal electrodes of a ferroelectric polymer, poly(vinylidene fluoride-trifluoroethylene) copolymer capacitor. The sandwiched structure Titanium/polypyrrole-poly(styrene sulfonate)/poly(vinylidene fluoride-trifluoroethylene)/polypyrrole-poly(styrene sulfonate)/titanium shows prominent ferroelectric properties even as the thickness of P(VDF-TrFE) film is down to 500 Å. The coercive voltage as low as 2.6 V is obtained with a remanent polarization of 86 mC/m2 and a switching time of 30 μs. The cell remains good ferroelectric properties at 60 °C, which is the operating temperature for many electronics. Moreover, the sandwiched structure shows excellent data retention, after more than 1×107 of switching cycles, the remanent polarization remains as high as 69 mC/m2. The soft conductive polymer electrodes not only increase the crystallinity but also enhance the crystal dipole orientation comparing with the conventionally used metal electrodes.

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Applied Physics Letters  (Volume:90 ,  Issue: 9 )