Characterization of polyester films used in capacitors. I. Transient and steady-state conductivity

Abstract

Charging and discharging currents flowing through polyethylene terephthalate (PET) ultrathin films (1.5–12 μm) were measured by the use of a two-electrode configuration involving opposite lateral contacts. A study of the influence of electrification time, applied electric field, film thickness, nature of electrodes, and water content was carried out on both transient and steady-state conduction. The transient behavior can be interpreted in terms of dipolar orientation and relaxation processes while steady-state conductivity can be mainly accounted for in terms of Schottky emission. A comparison between PET and polyethylene naphthalate films is also reported.

Peculiarities of high-temperature dielectric relaxation in vinylidene fluoride – hexafluoropropylene copolymers

“…This fact is often discussed at investigations by TSC and TSDC methods [16,17], where the dielectric is preliminary exposed to the electric field of high strength. In this case, the injection of carriers from the electrode into the polymer is possible and, consequently, the electrode material should affect this process.…”

Dielectrical properties of metal-insulator-metal aluminum nitride structures: Measurement and modeling

“…A study of the parameter influence such as the applied voltage, the electrode material, the dielectric thickness, and the temperature may lead to discriminate the impact of relaxation mechanisms 22 given above and decide the most probable for the AlN. Also, the comparison of the activation …”

Electrical conductivity effects in polyethylene terephthalate films

“…The investigation of electrical conductivity effects, such as space-charge formation and electrode polarization, is of particular importance for these and similar applications. [5][6][7][8] The method of thermally stimulated depolarization current ͑TSDC͒ has been widely used to investigate electrical conductivity effects in PET films. [7][8][9][10][11][12] At temperatures higher than that of the glass transition TSDC peak, one or several additional peaks are often observed and attributed to spacecharge effects and charge carrier trapping in the bulk of the sample and/or at the interface between the sample and the electrodes.…”

“…6,12 Transient and steady-state conductivity measurements were employed to separate dipolar from conductivity processes and to investigate the nature of the conduction mechanisms. 5,6,13 So far, less attention has been paid to the use of ac DRS to study effects related to dc conductivity in PET. The ac measurements on biaxially stretched PET films by Miyairi 14 at low frequencies (3ϫ10 Ϫ4 -10 Ϫ1 Hz) and high tempera-tures ͑150-220°C͒ showed a loss peak in tan ␦ attributed to electrode polarization.…”

“…The ac measurements on biaxially stretched PET films by Miyairi 14 at low frequencies (3ϫ10 Ϫ4 -10 Ϫ1 Hz) and high tempera-tures ͑150-220°C͒ showed a loss peak in tan ␦ attributed to electrode polarization. Adamec and Calderwood 15 employed ac measurements (10 Ϫ1 -10 5 Hz, 150-180°C͒ to investigate the field strength dependence of loss factor tan ␦ in commercial PET films and to compare it with the predictions of a model based on the modified three-dimensional Poole-Frenkel concept.…”