Physical and Numerical Modelling for Bipolar Charge Transport in Disorder Polyethylene Under High DC Voltage

Boukhris, Imed; Belgaroui, E.; Kallel, A.

doi:10.15676/ijeei.2010.2.4.6

Cited by 10 publications

(11 citation statements)

References 11 publications

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“…The contact electrode polyethylene is supposed to be perfect. 20 The model is onedimensional asymmetrical, a bipolar charge transport model for high direct-current (dc) voltage, taking into account the trapping effect on mobile carriers, and detrapping of charge in shallow traps (so called physical traps, related to the disordered structure). Deep trapping (so-called chemical traps) is described as a single traps level in which electrons or holes have insufficient energy for detrapping.…”

Section: Introductionmentioning

confidence: 99%

“…We consider that the shallow traps contributed only in the transport mechanism, and the deep traps contribute only to the charge accumulation. 20 The mobile carriers of electrons and holes were injected respectively according to the Schottky low from negative and positive electrodes, and had a constant effective mobility. The charge injection at the electrodes (electron and hole) migrate in the bulk of LDPE towards the opposite electrodes and can be extracted without an extraction barrier.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of Space Charge Dynamic in Polyethylene Under DC Continuous Electrical Stress

Boukhari¹,

Fatiha²

2016

Journal of Elec Materi

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The space charge dynamic plays a very important role in the aging and breakdown of polymeric insulation materials under high voltage. This is due to the intensification of the local electric field and the attendant chemicalmechanical effects in the vicinity around the trapped charge. In this paper, we have investigated the space charge dynamic in low-density polyethylene under high direct-current voltage, which is evaluated by experimental conditions. The evaluation is on the basis of simulation using a bipolar charge transport model consisting of charge injection, transports, trapping, detrapping, and recombination phenomena. The theoretical formulation of the physical problem is based on the Poisson, the continuity, and the transport equations. Numerical results provide temporal and local distributions of the electric field, the space charge density for the different kinds of charges (net charge density, mobile and trapped of electron density, mobile hole density), conduction and displacement current densities, and the external current. The result shows the appearance of the negative packet-like space charge with a large amount of the bulk under the dc electric field of 100 kV/mm, and the induced distortion of the electric field is largely near to the anode, about 39% higher than the initial electric field applied.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulation of Space Charge Dynamic in Polyethylene Under DC Continuous Electrical Stress

Boukhari¹,

Fatiha²

2016

Journal of Elec Materi

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“…For injection into a polymer such as LDPE and PVDF, the work function is 1.2 eV [15,16] and 1.2 eV [17]. Charge injection from the electrode into the polymer is further facilitated by lowering of the potential barrier through a combination of the image force and the applied field.…”

Section: Charge Injectionmentioning

confidence: 99%

“…Charge injection from a metal electrode into the LUMO band of the polymer by Schottky barrier thermionic emission are given by: (15) where A is the Richardson constant (=1.2×10 6 A/m 2 .K 2 ), and W n and W p are the energy barriers to injection in eV. The combined effect of the image force and the applied field results in a lowering of the barrier potential given by: (16) At higher applied fields, the slope gets steeper and the barrier is further lowered so that the tunneling length is much shorter, increasing the probability for tunneling through the barrier.…”

Section: Charge Injectionmentioning

confidence: 99%

Effect of degree of crystallinity on charge transport in ferroelectric semicrystalline polymer film

Lean¹,

Chu²

2015

IEEE Trans. Dielect. Electr. Insul.

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This paper describes 3D particle-in-cell (PIC) simulation of charge injection and transport through ferroelectric semicrystalline polymer (e.g. PVDF) film comprised of nanocrystallites in an amorphous matrix with varying degrees of crystallinity. The classical electrical double layer (EDL) model for a monopolar core is extended (eEDL) to represent the nanocrystallite by replacing it with a dipolar core. Charge injection at the electrodes assumes metal-polymer Schottky emission at low to moderate fields and Fowler-Nordheim tunneling at high fields. Injected particles propagate via field-dependent Poole-Frenkel mobility. In the eEDL model, the initial attachment of charge particles forms the bound Stern-Helmholtz layer leading to Maxwell-Wagner-Sillars polarization. Subsequent waves of charge particles are repelled by the attached charge resulting in the diffuse Gouy- Chapman transport layer. The simulation algorithm uses a boundary integral equation method (BIEM) for solution of the Poisson equation coupled with a second-order predictorcorrector scheme for robust time integration of the equations of motion. The stability criterion of the explicit algorithm conforms to the Courant-Friedrichs-Levy (CFL) limitassuring robust and rapid convergence. The model is capable of simulating a wide dynamic range spanning leakage current to pre-breakdown levels. Simulation results for semicrystalline film with varying degrees of crystallinity indicate that charge transport behavior depends on nanoparticle polarization with anti-parallel orientation showing the highest conduction and therefore lowest level of charge trapping in the interaction zone. Charge attachment to nanocrystallites increase with vol% loading or degree of crystallinity, and saturates at 40 vol% for the set of simulation parameters. The eEDL model predicts the intuitive meandering pathways of charge particle trajectories, which get progressively more inclined from normal incidence with increasing vol% loading.

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“…1D bipolar charge transport models capable of handling leakage current up to pre-breakdown levels have been successfully applied to layered polymer films. [7][8][9] Axisymmetric models capable of handling divergent field configurations have been reported. 10,11 However, continuum charge transport models are not suited to simulate material with morphology at the nanometer length scale.…”

Section: Introductionmentioning

confidence: 99%

Simulation of bipolar charge transport in nanocomposite polymer films

Lean¹,

Chu²

2015

Journal of Applied Physics

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This paper describes 3D particle-in-cell simulation of bipolar charge injection and transport through nanocomposite film comprised of ferroelectric ceramic nanofillers in an amorphous polymer matrix. The classical electrical double layer (EDL) model for a monopolar core is extended (eEDL) to represent the nanofiller by replacing it with a dipolar core. Charge injection at the electrodes assumes metal-polymer Schottky emission at low to moderate fields and Fowler-Nordheim tunneling at high fields. Injected particles migrate via field-dependent Poole-Frenkel mobility and recombine with Monte Carlo selection. The simulation algorithm uses a boundary integral equation method for solution of the Poisson equation coupled with a second-order predictor-corrector scheme for robust time integration of the equations of motion. The stability criterion of the explicit algorithm conforms to the Courant-Friedrichs-Levy limit assuring robust and rapid convergence. The model is capable of simulating a wide dynamic range spanning leakage current to pre-breakdown. Simulation results for BaTiO 3 nanofiller in amorphous polymer matrix indicate that charge transport behavior depend on nanoparticle polarization with anti-parallel orientation showing the highest leakage conduction and therefore lowest level of charge trapping in the interaction zone. Charge recombination is also highest, at the cost of reduced leakage conduction charge. The eEDL model predicts the meandering pathways of charge particle trajectories. V C 2015 AIP Publishing LLC. [http://dx.

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Physical and Numerical Modelling for Bipolar Charge Transport in Disorder Polyethylene Under High DC Voltage

Cited by 10 publications

References 11 publications

Simulation of Space Charge Dynamic in Polyethylene Under DC Continuous Electrical Stress

Simulation of Space Charge Dynamic in Polyethylene Under DC Continuous Electrical Stress

Effect of degree of crystallinity on charge transport in ferroelectric semicrystalline polymer film

Simulation of bipolar charge transport in nanocomposite polymer films

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