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Influense of the high-voltage conductivity on peculiarity of polarization ferroelectric polymer on based vinylidenefluoride

  • Kochervinskii, V.V. (Karpov Institute of Physical Chemistry) ;
  • Chubunova, E.V. (Moscow Engineering Physics Institute, National Nuclear Research University) ;
  • Lebedinskii, Y.Y. (Moscow Engineering Physics Institute, National Nuclear Research University) ;
  • Pavlov, A.S. (Karpov Institute of Physical Chemistry) ;
  • Pakuro, N.I. (Karpov Institute of Physical Chemistry)
  • Received : 2015.05.19
  • Accepted : 2015.09.15
  • Published : 2015.06.25
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Abstract

The phenomena of high-voltage polarization and conductivity in oriented vinylidenefluoride and tetrafluoroethylene copolymer films have been investigated. It was shown that under certain electric fields, injection of carriers from the material of electrodes appears The barrier for holes injection in the copolymer was found to be lower than that for electrons. It results in more effective screening of the external field near the anode than near cathode. Electrones, ejected from cathode, creating negative charge by trapping on the surface. It is shown that the electrons injected from cathodes create a negative homocharge on the copolymer surface and then become captured on the surface shallow traps. Their nature has been studied by the x-ray photoelectron spectroscopy. It was shown that these traps may consist of chemical defects in the form of new functional groups formed by reactions of surface macromolecules with sputtered atoms of aluminum. The asymmetric shape of hysteresis curves was explained by the difference in mobility of injected holes and electrons. These factors caused appearance of "non-closed" hysteresis curves for fluorine-containing polymer ferroelectrics. Hysteresis phenomena observed at low electric fields (below coercive ones) are to associate with the behavior of the domains localized in the ordered regions formed during secondary crystallization of copolymers.

Keywords

References

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