Space charge and solid insulating materials: In pursuit of space charge control by molecular design

Ieda, Masayuki; Suzuoki, Y.

doi:10.1109/57.637149

Cited by 13 publications

(2 citation statements)

References 31 publications

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“…The value of the charge density does not appear inconsistent with the experimental data, since maximum charge densities of the order 100 µC cm −3 have already been measured in relatively thin polymeric films ( 1 mm). For example, in 18 µm thick polypropylene under 3.0 MV cm −1 , and in 200 µm thick crosslinked polyethylene (XLPE) under 1.2 MV cm −1 dc stress, charge densities of the order of 200 µC cm −3 have been reported [8] for short stressing times. The possibility that higher values can be found for a higher field (3.4 MV cm −1 ) and a much longer stressing time is therefore reasonable.…”

Section: Space Charge Profilementioning

confidence: 99%

Dependence of electroluminescence intensity and spectral distribution on ageing time in polyethylene naphthalate as modelled by space charge modified internal field

Teyssèdre¹,

Mary²,

Augé³

et al. 1999

J. Phys. D: Appl. Phys.

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Wavelength-resolved electroluminescence and current measurements have been performed on polyethylene naphthalate thin films submitted to high direct current fields (3.4 MV cm-1) for several days. The change in the shape of the emission spectrum over time resembles that observed in short-term experiments when the field is increased. This behaviour provides the basis for a model in which the time evolution of the spectrum shape is attributed to the progressive charging of the material, through homopolar injection. The net result is an increase of the internal field in the charge-free region where luminescence occurs.

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Section: Space Charge Profilementioning

confidence: 99%

Dependence of electroluminescence intensity and spectral distribution on ageing time in polyethylene naphthalate as modelled by space charge modified internal field

Teyssèdre¹,

Mary²,

Augé³

et al. 1999

J. Phys. D: Appl. Phys.

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“…Such defects can introduce charge carrier (or defect) states within the band gap of PE, can act as traps and sources of charge carriers, catalyze further damage, and can deleteriously affect the overall conduction behavior of the insulator. [2][3][4][5][6] It is thus critical that a firm understanding of the nature of such defects be obtained.…”

Section: Introductionmentioning

confidence: 99%

Unraveling the luminescence signatures of chemical defects in polyethylene

Chen

Huan

Wang

et al. 2015

The Journal of Chemical Physics

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Chemical defects in polyethylene (PE) can deleteriously downgrade its electrical properties and performance. Although these defects usually leave spectroscopic signatures in terms of characteristic luminescence peaks, it is nontrivial to make unambiguous assignments of the peaks to specific defect types. In this work, we go beyond traditional density functional theory calculations to determine intra-defect state transition and charge recombination process derived emission and absorption energies in PE. By calculating the total energy differences of the neutral defect at excited and ground states, the emission energies from intra-defect state transition are obtained, reasonably explaining the photoluminescence peaks in PE. In order to study the luminescence emitted in charge recombination processes, we characterize PE defect levels in terms of thermodynamic and optical charge transition levels that involve total energy calculations of neutral and charged defects. Calculations are performed at several levels of theory including those involving (semi)local and hybrid electron exchange-correlation functionals, and many-body perturbation theory. With these critical elements, the emission energies are computed and further used to clarify and confirm the origins of the observed electroluminescence and thermoluminescence peaks.

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Effect of magnetic compound electrode on space charge injection and accumulation in LDPE

Zhang

Xing

et al. 2020

Applied Physics Letters

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Space charge accumulation is the main factor in accelerating the degradation of polymeric insulation in high-voltage direct current (HVDC) cables. It is essential for the development of HVDC cables to suppress the space charge in the insulating layer. In this paper, an approach is presented to decrease carrier injection from the inner semiconductive layer to the insulating layer, using a magnetic semiconductive compound. The semiconductive shielding compound was prepared by adding strontium ferrite to a carbon black/ethylene-vinyl acetate/low-density polyethylene (LDPE) matrix. The addition of strontium ferrite led to an increase in the residual magnetic induction of the semiconductor shielding layer. Unmagnetized and magnetized semiconductive compounds were used as electrodes to test the injection of carriers into the LDPE insulation layer. When SrFe12O19 had been added, the charge injected into the LDPE by the magnetized semiconductive layer was less than with an unmagnetized semiconductive layer. When the content of SrFe12O19 was 5 wt. %, 10 wt. %, 30 wt. %, and 50 wt. % in the semiconductive compound, the charge in the LDPE was reduced by 4.2%, 8.1%, 12.5%, and 27.1%, respectively.

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Space charge and solid insulating materials: In pursuit of space charge control by molecular design

Cited by 13 publications

References 31 publications

Dependence of electroluminescence intensity and spectral distribution on ageing time in polyethylene naphthalate as modelled by space charge modified internal field

Dependence of electroluminescence intensity and spectral distribution on ageing time in polyethylene naphthalate as modelled by space charge modified internal field

Unraveling the luminescence signatures of chemical defects in polyethylene

Effect of magnetic compound electrode on space charge injection and accumulation in LDPE

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