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Polarization of poly(vinylidene fluoride) and poly(vinylidene fluoride-trifluoroethylene) thin films revealed by emission spectroscopy with computational simulation during phase transition
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10.1063/1.4721373
/content/aip/journal/jap/111/10/10.1063/1.4721373
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/10/10.1063/1.4721373
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic of energy zones, and their shift under the influence of an electric field, from polarization of PVDF or P(VDF-TrFE) thin films deposited on a glass substrate: Φ, thermo-electronic emission work function; χ and χ eff , affinity and the effective affinity of an electron; φ, energy of electric field E P inside of PVDF or P(VDF-TrFE) film with polarization P and thickness x ; E F , energy of Fermi level; E c and E v , energies of the conductance and the valence bands in the PVDF or P(VDF-TrFE) film.

Image of FIG. 2.
FIG. 2.

TSEE spectra of the P(VDF-TrFE) films deposited on the glass substrate: (a) the P(VDF-TrFE) films with a thickness of 10 (10 ML) and 30 (30ML) monolayers; (b) the fitted lines of Eq. (1) for the 30 ML film.

Image of FIG. 3.
FIG. 3.

TSEE spectra of the 10 ML P(VDF-TrFE) films deposited on the glass substrate: (a) the 10 ML P(VDF-TrFE) films before and after radiation; (b) the fitted lines of Eq. (1) for the 10 ML film.

Image of FIG. 4.
FIG. 4.

Dependence of energies E LUMO vs. numbers of polymer units for different conformations (T and G), computed by various methods.

Image of FIG. 5.
FIG. 5.

Energy dependence vs. numbers of polymers units: (a) energies of the forbidden zone Eg; (b) energies of the E HOMO.

Image of FIG. 6.
FIG. 6.

Model of the P(VDF-TrFE) cell in two conformations: (a) trans (T), (b) gauche (G).

Image of FIG. 7.
FIG. 7.

Schematic of energies zones and their shiftunder influence of the electric field during phase transition between trans and gauche conformations. EA, electron affinity; E HOMO and E LUMO, highest occupied and lowest unoccupied molecular orbital, respectively; Eg, forbidden energy gap (E HOMO − E LUMO); Ef0 = Eg/2; Φ, the energy level of the thermo emission electron work function (Φ Eg/2 + EA ∼ Eg/2 − E LUMO).

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/content/aip/journal/jap/111/10/10.1063/1.4721373
2012-05-29
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Polarization of poly(vinylidene fluoride) and poly(vinylidene fluoride-trifluoroethylene) thin films revealed by emission spectroscopy with computational simulation during phase transition
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/10/10.1063/1.4721373
10.1063/1.4721373
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