Effect of crystal structure on polarization reversal and energy storage of ferroelectric poly(vinylidene fluoride-co-chlorotrifluoroethylene) thin films

“…When the number of bilayers was up to six, the average crystallite size did not present an obvious change. It was helpful to resist the leakage current, which was beneficial to V ds [25,26]. …”

Section: Resultsmentioning

confidence: 99%

Properties-Adjustable Alumina-Zirconia Nanolaminate Dielectric Fabricated by Spin-Coating

et al. 2017

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In this paper, an alumina-zirconia (Al2O3-ZrO2) nanolaminate dielectric was fabricated by spin-coating and the performance was investigated. It was found that the properties of the dielectric can be adjusted by changing the content of Al2O3/ZrO2 in nanolaminates: when the content of Al2O3 was higher than 50%, the properties of nanolaminates, such as the optical energy gap, dielectric strength (Vds), capacitance density, and relative permittivity were relatively stable, while the change of these properties became larger when the content of Al2O3 was less than 50%. With the content of ZrO2 varying from 50% to 100%, the variation of these properties was up to 0.482 eV, 2.12 MV/cm, 135.35 nF/cm2, and 11.64, respectively. Furthermore, it was demonstrated that the dielectric strength of nanolaminates were influenced significantly by the number (n) of bilayers. Every increment of one Al2O3-ZrO2 bilayer will enhance the dielectric strength by around 0.39 MV/cm (Vds ≈ 0.86 + 0.39n). This could be contributed to the amorphous alumina which interrupted the grain boundaries of zirconia.

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“…[ 1–18 ] Currently, polymer dielectrics are the preferred electroactive materials for these purposes, owing to their high breakdown strength, easy processing conditions, and high scalability. [ 19–25 ] To enhance their dielectric permittivities, which are usually below 10, novel nanocomposite films have been developed by introducing inorganic high dielectric constant nanofillers into the host polymer matrix. Such electroactive nanocomposites have promise as smart materials in many applications.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Study of Nanocomposite Permittivity with a Tunable Clustering of Inclusions

Allahyarov

2020

Advcd Theory and Sims

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A new analytical model is proposed for the nanocomposite permittivity eff in mean-field approach using integrated coefficients for the inclusion clustering and matrix reaction effects. Predictions for eff are in a satisfactory agreement with the Lichtenecker and Bruggeman mixing rules, depending on whether the reaction field is ignored or incorporated into the theory. The observed differences between the Maxwell-Garnett, Lichtenecker, and Bruggeman results are interpreted in terms of the fraction of the stored dipolar energy they take into account. A novel analytical expression for the average dipolar field ⟨ ⃗ E ⟩ in the film shows a U-shaped dependence on the filler packing fraction , with an absolute maximum at m = 1/e. New analytical expressions derived for the average dipolar energy u m and dipole-dipole interaction energy u m in the nanocomposite depend on the cluster orientation parameter , and take into account the film boundary effects. It is found that the enhancement of eff at higher is associated with an increase in the inclusion dipole moment p in the oriented clusters resulting from dipole-dipole correlations, which inflate the energy u p stored inside the inclusions.

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Effect of crystal structure on polarization reversal and energy storage of ferroelectric poly(vinylidene fluoride-co-chlorotrifluoroethylene) thin films

Cited by 37 publications

References 18 publications

Temperature dependence of piezo- and ferroelectricity in ultrathin P(VDF–TrFE) films

Temperature dependence of piezo- and ferroelectricity in ultrathin P(VDF–TrFE) films

Properties-Adjustable Alumina-Zirconia Nanolaminate Dielectric Fabricated by Spin-Coating

Theoretical Study of Nanocomposite Permittivity with a Tunable Clustering of Inclusions

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