Influence of phase transitions on the spontaneous voltage in P(VDF/TrFE) copolymers

Neto, Jorge Munaiar; Oliveira, O.N.; Faria, R.M.

doi:10.1007/s003390000501

Cited by 4 publications

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“…This apparent asymmetry, possibly due to processing differences between top and bottom electrodes, [29][30][31] persists for all imprint times. The ϪP poled FR-TSC is greater than +P FR-TSC by a factor of 2-3 over the entire temperature range where imprint-induced charging is readily observed ͑20-60°C͒.…”

Section: A Typical Fr-tsc Measurementsmentioning

confidence: 89%

Quantifying electronic charge trap states and the effect of imprint on ferroelectric poly(vinylidene fluoride-trifluoroethylene) thin films

Lew

Thompson

2010

Journal of Applied Physics

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Articles you may be interested inThe effect of electroactive interlayer on the ferroelectric properties in poly(vinylidene fluoride-trifluoroethylene) copolymer ultrathin films Interface screening and imprint in poly(vinylidene fluoride/trifluoroethylene) ferroelectric field effect transistors J. Appl. Phys. 105, 054110 (2009); 10.1063/1.3088887Characterizing trapped charge dynamics in imprinted poly(vinylidene fluoride-trifluoroethylene) ferroelectric thin films using the fast ramp thermally stimulated current technique Poly͑vinylidene fluoride-trifluoroethylene͒ ͓P͑VDF-TrFE͔͒ thin films have been extensively studied for their ferroelectric properties and are a promising material for sensing and memory applications. Imprint, the time-dependent resistance to polarization reversal, is a key material property that limits applications and is poorly understood. We have used a fast ramp rate thermally stimulated current ͑FR-TSC͒ technique to investigate the proposed link between imprint time and filling of charge trap states, and to characterize these traps in an appropriate time-frame. Thin films of P͑VDF-TrFE͒ on oxidized Si substrates were characterized following controlled initialization, fatigue, polarization, and imprint. Traps were allowed to fill during room temperature imprint for times from 1 to 10 4 s. Remaining unfilled traps were subsequently filled and quantified by FR-TSC temperature cycling from 20 to 100°C at 1 K/s. Results confirm that charge trap filling occurs both with time, under isothermal conditions, as well as with increasing temperature. The rate of charge accumulation induced by FR-TSC exhibits the same logarithmic dependence with time as the experimentally measured imprint voltage; this strongly suggests a direct link between these trapped charges and the imprint field. Furthermore, measurements of the switching speed in post FR-TSC films were found to be independent of the imprint time, confirming that thermal cycling brought all samples to a common final state. These results provide further understanding of the polarization dynamics and materials interactions affecting the ferroelectric properties of P͑VDF-TrFE͒.

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Section: A Typical Fr-tsc Measurementsmentioning

confidence: 89%

Quantifying electronic charge trap states and the effect of imprint on ferroelectric poly(vinylidene fluoride-trifluoroethylene) thin films

Lew

Thompson

2010

Journal of Applied Physics

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“…There are two importance observations: (1) It can be concluded that the 75/25 P(VDF-TrFE) with smaller 𝜑 has poor ferroelectricity, which is consistent with the previous results. [50,51] (2) Nanofibers with larger diameter hold the higher 𝜑 for both positive and negative electric fields. The larger diameter of ferroelectric polymer nanofiber contains more polar phase (𝛽-phase), and the effect of phonon renormalization of molecular chains becomes more obvious.…”

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confidence: 99%

Tunable Thermal Conductivity of Ferroelectric P(VDF-TrFE) Nanofibers via Molecular Bond Modulation

Dong

Liu²,

Wang³

et al. 2022

Chinese Phys. Lett.

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The dipoles in ferroelectric copolymer P(VDF-TrFE) can be driven by electric field, introducing phonon transport modulations through polarizing molecular chains. The thermal conductivity in single 75/25 P(VDF-TrFE) nanofibers is found to increase with electric field related phonon renormalization, resulted from change in vibrational assignment excited by polarization process. This is evidenced by a direct change of bond energy and bond length in 75/25 P(VDF-TrFE) nanofibers from Raman characterization under polarization electric field. The experimental results provide further intuitive evidences that the size of ferroelectric polymers could directly affect the ferroelectricity from the size-dependent thermal transport measurement.

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Characterizing trapped charge dynamics in imprinted poly(vinylidene fluoride-trifluoroethylene) ferroelectric thin films using the fast ramp thermally stimulated current technique

Lew

Thompson

2009

Journal of Applied Physics

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Poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) ferroelectric thin films are promising materials for sensors, nonvolatile memory applications, and energy harvesting. Imprint, the time-dependent resistance to polarization reversal, is a key material property that limits electronic applications and is poorly understood. In this work, we investigated the link between imprint and charge trap states within the film. A fast ramp rate thermally stimulated current (FR-TSC) measurement was developed to quantify and characterize trapped charge dynamics in imprinted P(VDF-TrFE) thin films in an appropriate time frame. Thin films of P(VDF-TrFE) on oxidized Si substrates were characterized following controlled initialization, polarization, and imprint. Trap states were thermally filled/emptied by temperature cycling between 20 °C and 100 °C using heating and cooling rates of 1 K/s. Dynamics of this fast-ramp TSC indicate the presence of not only trap states but also reversible and irreversible charge accumulation. Results also show an asymmetry with respect to poling orientation, indicating that traps are influenced by processing conditions and contact materials. The development of this FR-TSC technique provides understanding of polarization dynamics and material interactions affecting ferroelectric properties of P(VDF-TrFE).

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Influence of phase transitions on the spontaneous voltage in P(VDF/TrFE) copolymers

Cited by 4 publications

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Quantifying electronic charge trap states and the effect of imprint on ferroelectric poly(vinylidene fluoride-trifluoroethylene) thin films

Quantifying electronic charge trap states and the effect of imprint on ferroelectric poly(vinylidene fluoride-trifluoroethylene) thin films

Tunable Thermal Conductivity of Ferroelectric P(VDF-TrFE) Nanofibers via Molecular Bond Modulation

Characterizing trapped charge dynamics in imprinted poly(vinylidene fluoride-trifluoroethylene) ferroelectric thin films using the fast ramp thermally stimulated current technique

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