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.
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.
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.
Dependence of energies E LUMO vs. numbers of polymer units for different conformations (T and G), computed by various methods.
Energy dependence vs. numbers of polymers units: (a) energies of the forbidden zone Eg; (b) energies of the E HOMO.
Model of the P(VDF-TrFE) cell in two conformations: (a) trans (T), (b) gauche (G).
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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