Molecular modeling of electron trapping in polymer insulators

Meunier, Marc; Quirke, N.

doi:10.1063/1.481802

Cited by 258 publications

(159 citation statements)

References 24 publications

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“…This may serve as evidence that charge injection from the top has taken place. Polyethylene is a typical semi-crystalline material; it contains various charge traps [13]. Therefore, it is believed that the injected charge is captured by traps on its way towards the opposite electrode.…”

Section: Pea Resultsmentioning

confidence: 99%

Decay of electric charge on corona charged polyethylene

Xu¹,

Zhang²,

Chen³

2007

J. Phys. D: Appl. Phys.

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This paper describes a study on the surface potential decay of corona charged low density polyethylene (LDPE) films. A conventional corona charging process is used to deposit charge on the surface of film and surface potential is measured by a compact JCI 140 static monitor. The results from corona charged multilayer sample reveal that the bulk process dominates charge decay. In addition, the pulsed-electro-acoustic (PEA) technique has been employed to monitor charge profiles in corona charged LDPE films. By using the PEA technique, we are able to monitor charge migration through the bulk. Charge profiles in corona charged multilayer sample are consistent with surface potential results. Of further significance, the charge profiles clearly demonstrate that double injection has taken place in corona charged LDPE films.

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Section: Pea Resultsmentioning

confidence: 99%

Decay of electric charge on corona charged polyethylene

Xu¹,

Zhang²,

Chen³

2007

J. Phys. D: Appl. Phys.

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“…One of the propositions for this mechanism is that, despite the affinities of different signs, both He and CH 4 impurities turns out to be effective traps in solid Ne, which scavenge electrons, thus not allowing them to escape into the vacuum. The observed effect is related to the processes of electron trapping in insulator materials [8,9]. The authors established a relationship between the electron trap and the molecular properties of the material.…”

Section: Resultsmentioning

confidence: 91%

“…It follows from examining of Eqs. (8) and (9) flows A(p) may increase reaching a maximum. Whether the gains in emission can be significant remains to be seen in experiments which are planned now.…”

Section: Resultsmentioning

confidence: 99%

“…It is thought that the defects are relatively shallow traps, while much deeper traps could be a guest atom or molecule with positive electron affinity [5]. The atomic He, however, is a particle with very small positive affinity, 0.0054 Ry [6] which is equal 0.073 eV, and CH 4 molecule has negative electron affinity, E a = -5 eV [7,8]. The mechanism for the decrease in electron emission by impurity particles in our experiments is not clear at present.…”

Section: Resultsmentioning

confidence: 99%

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Photoelectron emission from solid Ne tested by impurity adsorption

Dmitriev¹

2009

Low Temperature Physics

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Electron emission was obtained from a solid Ne sample growing from the gas phase on a low temperature substrate. The surface of the sample was irradiated by the light of an open-source microwave discharge running in the gaseous Ne. A second gas flow of CH 4 was, simultaneously, passed onto the substrate avoiding the discharge zone. Free electrons ejected into a vacuum chamber during the sample growth were detected by means of the electron cyclotron resonance (ECR) technique. The electron yield was found to be decrease at increasing CH 4 flow. Fitting curves to the experimental data showed that the surface CH 4 impurities played the major role in emission quenching. A temperature effect was observed in which a 4.2 K sample was much more sensitive to CH 4 doping than a 1.6 K one. Based on the experimental results, a model was proposed of the surface sites where electrons escape the solid.

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“…According to Quirke et al [16,17], the shallow traps have a very weak residence time of about 10 -12 s and the deep traps have an infinite residence time. For these reasons, we consider that the shallow traps are only integrated in transport mechanism and the deep traps contribute only to the charge accumulations.…”

Section: Hypothesis and Computational Proceduresmentioning

confidence: 99%

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

Boukhris¹,

Belgaroui²,

Kallel³

2010

ijeei

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Laboratoire des matériaux composites céramiques et polymères (LaMaCoP) Faculté des sciences de Sfax BP 805 Sfax 3000 Tunisie. imed_boukhris@yahoo.frAbstract: This paper reports on validation of a numerical model for both transient and steady bipolar charge transport, trapping and recombination in polymeric insulators, such as low density polyethylene. The numerical model is based on the high precision Runge-Kutta method for determining mobile and trapped charge local density within the sample, during the application of a DC voltage. In addition, we have applied the finite element method considered as the most general one, which can be applied to any sample shape and boundary conditions. It is applied to resolve Poisson's equation, thus providing the potential and its gradient within the sample and at the dielectric-electrode interfaces. The principal results show the appearance of charge packets for the first time in modeling works although they have long been reported in experimental studies on polyethylene materials. The conditions for the appearance of such packets are discussed. For the net space charge density and the conduction current, the dynamics are in a good agreement with those observed in some experimental works during the transit time of the bipolar carriers. The model is already numerically validated for the space charge densities and the electric field distribution under low DC voltage.

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Molecular modeling of electron trapping in polymer insulators

Abstract: Articles you may be interested inEffect of temperature on trap depth formation in multi-layer insulation: Low density polyethylene and fluorinated ethylene propylene Appl. Phys. Lett.From ab initio quantum chemistry to molecular dynamics: The delicate case of hydrogen bonding in ammonia

Cited by 258 publications

References 24 publications

Decay of electric charge on corona charged polyethylene

Decay of electric charge on corona charged polyethylene

Photoelectron emission from solid Ne tested by impurity adsorption

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

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