Dielectric and piezoelectric properties of very thin films of VDF-TrFE copolymers

Glatz-Reichenbach, J.; Lijie,; Schilling, D.; Schreck, Erhard; Dransfeld, Klaus

doi:10.1080/00150199008211431

Cited by 23 publications

(7 citation statements)

References 12 publications

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“…The results are consistent with early dielectric studies by Glatz-Reichenbach et al and Tajits. 5,9 In summary, these results suggest that the ferroelectric property does not change very much with thickness for the P͑VDF-TrFE͒ films investigated here. The observed increase in the ferroelectric switching time with reducing film thickness in the thin film region is caused by the interface effect which can be modeled by a low dielectric layer in series with the bulk of the film, and for films investigated here, this layer has a thickness of about 2.7 nm and an effective dielectric constant of 3.…”

Section: ͑5͒supporting

confidence: 51%

Thickness dependence of ferroelectric polarization switching in poly(vinylidene fluoride–trifluoroethylene) spin cast films

Xia

Fang

et al. 2001

Applied Physics Letters

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Section: ͑5͒supporting

confidence: 51%

Thickness dependence of ferroelectric polarization switching in poly(vinylidene fluoride–trifluoroethylene) spin cast films

Xia

Fang

et al. 2001

Applied Physics Letters

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“…In recent years, the ferroelectricity of ultrathin P(VDF‐TrFE) films, thinner than 1 μm, including Langmuir–Blodgett films, has attracted a great deal of attention 5–12. The investigation of ultrathin ferroelectric polymer films will be helpful to understand the fundamental question of the critical size of the film or grain.…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties and ferroelectric behavior of poly(vinylidene fluoride‐trifluoroethylene) 50/50 copolymer ultrathin films

2001

J of Applied Polymer Sci

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Ultrathin films of poly(vinylidene fluoride-trifluoroethylene) copolymer [P(VDF-TrFE), with a content (mol %) ratio of 50/50 VDF/TrFE] were fabricated on silicon wafers covered with platinum by a spin-coating technique, ranging in thickness from 20 nm to 1 m. The effect of thickness on dielectric properties and polarization behavior was investigated. A critical thickness was found to be about 0.1 m. An abrupt drop of dielectric constant was observed, although there is no significant change in dielectric loss at this thickness. Square and symmetric hysteresis loops were obtained in films thicker than 0.1 m. However, for films thinner than 0.1 m, fewer square hysteresis loops were observed. SEM and X-ray results demonstrate that the effect of thickness on dielectric and ferroelectric properties could be explained by the changes of crystal structure in these films. In addition, the effects of irradiation on dielectric property and polarization response for ultrathin P(VDF-TrFE) films were also presented.

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“…This advantage is particularly valuable for the study of thin films where the conduction current [5,6] can no longer be neglected. This advantage is particularly valuable for the study of thin films where the conduction current [5,6] can no longer be neglected.…”

Section: Lie-jie Et Almentioning

confidence: 99%

“…After poling they also become piezoelectric and pyroelectric. Recently it has been found that very thin films show a considerable unexpected electrical conductivity in very high electric fields [5,6]. Ferroelectric polymers can be produced by spin coating as very thin films having a thickness of only 100 nm or less [4].…”

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confidence: 99%

Fast polarization reversal in thin copolymer films of vinylidene fluoride-trifluoroethylene

1991

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In this paper we present new experiments on the switching of the polarization in thin (< 1 ~tm) ferroelectric copolymer films of P(VDF-TrFE). We observed an unexpectedly short switching time for these thin films: The polarization of a 0.2 ~tm thick film could be reversed by poling fields of 600MV/m in less than lOOns. This result which may revive interest in ferroelectric data storage is discussed in terms of a switching process which also involves the ohmic conductivity of the sample.

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Dielectric and piezoelectric properties of very thin films of VDF-TrFE copolymers

Cited by 23 publications

References 12 publications

Thickness dependence of ferroelectric polarization switching in poly(vinylidene fluoride–trifluoroethylene) spin cast films

Thickness dependence of ferroelectric polarization switching in poly(vinylidene fluoride–trifluoroethylene) spin cast films

Dielectric properties and ferroelectric behavior of poly(vinylidene fluoride‐trifluoroethylene) 50/50 copolymer ultrathin films

Fast polarization reversal in thin copolymer films of vinylidene fluoride-trifluoroethylene

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