Description of charge transport in polyethylene using a fluid model with a constant mobility: fitting model and experiments

Roy, Séverine Le; Teyssèdre, G.; Laurent, Christian; Montanari, Gian Carlo; Palmieri, F.

doi:10.1088/0022-3727/39/7/014

Cited by 159 publications

(184 citation statements)

References 19 publications

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“…And J h is the injection current density from the anode. With high voltage applied, charge injection behavior at the metal-polyethylene interface was verified conforming to Schottky injection mechanism 9,20,21 , which has already been applied into some previous modelling works on polyethylene 18,22,23 . Such conduction mechanism demonstrates that barrier height at the electrode-dielectric interface is lowered by the applied field and image charge force so that enhanced current density from electrodes takes place.…”

Section: Volts-on Conditionsupporting

confidence: 57%

An improved model to estimate trapping parameters in polymeric materials and its application on normal and aged low-density polyethylenes

Liu

Alghamdi

et al. 2015

Journal of Applied Physics

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Trapping parameters can be considered as one of the important attributes to describe polymeric materials. In the present paper, a more accurate charge dynamics model has been developed, which takes account of charge dynamics in both volts-on and off stage into simulation. By fitting with measured charge data with the highest R-square value, trapping parameters together with injection barrier of both normal and aged low-density polyethylene (LDPE) samples were estimated using the improved model. The results show that, after long-term ageing process, the injection barriers of both electrons and holes is lowered, overall trap depth is shallower and trap density becomes much greater. Additionally, the changes in parameters for electrons are more sensitive than those of holes after ageing.

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Section: Volts-on Conditionsupporting

confidence: 57%

An improved model to estimate trapping parameters in polymeric materials and its application on normal and aged low-density polyethylenes

Liu

Alghamdi

et al. 2015

Journal of Applied Physics

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“…The bipolar model developed is derived from [10]. It is one-dimensional, function of the position in the dielectric, and based on the scheme presented in figure 3.…”

Section: Model Equationsmentioning

confidence: 99%

“…This coefficient is difficult to determine experimentally, for the type of material under study. It has been calculated in [6] as being function of the deposited energy rate per unit area W: (10) e is the elementary charge, N the area under the normalized dose rate and has been calculated from figure 4b (N=0.585); r corresponds to the irradiated region (490µm), and E 0 is the mean energy required to create a pair. We retained the value of E 0 =30 eV given in [6].…”

Section: Sensitivity Analysis To Irradiation Parameters 431 Electrmentioning

confidence: 99%

Charge transport modelling in electron-beam irradiated dielectrics: a model for polyethylene

Roy¹,

Baudoin²,

Griseri³

et al. 2010

J. Phys. D: Appl. Phys.

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This paper proposes a numerical model for describing charge accumulation in electron-beam irradiated low density polyethylene. The model is bipolar, and based on a previous model dedicated to space charge accumulation in solid dielectrics under electrical stress. It encompasses the generation of positive and negative charges due to the electron beam and their transport in the insulation. A sensitivity analysis of the model to parameters specific to electron beam irradiation is performed in order to understand the impact of each process on the space charge distribution. At last, a direct comparison between time dependent space charge distribution issued from the model and from measurements is performed. The transport parameters used for the simulations are the same as those optimized for transportation in polyethylene under an external electric field giving a robustness in the modelling approach because of the constrains on fitting parameters that must comply to a set of experimental results.PACS Numbers: 72.20Ht, 72.20Jv 1. Introduction Solid dielectrics used as thermal blanket on geostationary satellites are submitted to the flow of several types of charged particles, and particularly to electrons. These materials can accumulate charges, building up the potential inside the dielectric, meaning a potential difference between different parts of the satellite. Electrostatic Surface Discharge (ESD) can occur, leading to possible damages of the electronics of the satellite [1]. In order to prevent such ESD to happen, it is necessary to understand the dynamics of the charge transport in solid dielectrics used in space environment. A number of studies have been carried out in this domain. Some are experimental, measuring the surface potential of the irradiated samples, the current flow during irradiation [2] and the space charge distribution after irradiation [3]. Recently, two original set-ups [4-5] to measure space charge distribution in electronbeam irradiated samples have been developed on the basis of the Pulsed Electro-Acoustic (PEA) method. With these experimental tools, it is now possible to observe the dynamic of charging and discharging in electron-beam irradiated materials. On the other hand, a number of works on theoretical background and simulation has been done in order to understand and reproduce the behaviour of charge in electron beam irradiated polymers [6][7][8][9]. Our very aim is to develop space charge modelling in electron beam irradiated materials in nonstationary conditions through an approach that closely associates experiment and numerical simulation. Within the first part of this paper, we briefly review the state-of-the-art on modelling charge transport in synthetic insulations under electron beam irradiation in order to establish the position of our approach. Then, we describe the proposed model, which has been adapted from a previous one [10] developed for space charge conduction in a Low Density Polyethylene (LDPE) under DC stress. The same set of transport parameters has b...

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“…18,30 Such work led to a set of parameters, reported in Table II that appears suitable to describe the behavior of LDPE. The first objective of this work is to compare the outputs of the two models for initial conditions that are as close as possible.…”

Section: Resolution and Applicationmentioning

confidence: 99%

“…As an experimental basis, we have considered the charging and discharging behaviors of a 150 m thick LDPE film with 40 kV/ mm applied field and 3 h of charging/discharging time at room temperature. Ex- perimental data on space charge measurements 18 have been obtained by the pulsed electroacoustic ͑PEA͒ technique. The results produced by either model cannot be directly compared to experimental data, especially the space charge profiles obtained by the PEA method, firstly because only internal charges are produced by the simulation that do not influence charges on the electrodes; secondly, profiles obtained by the PEA method are, as with any other technique, accompanied by uncertainty in the position of the charges.…”

Section: Comparison Of Model Ouputsmentioning

confidence: 99%

Models of bipolar charge transport in polyethylene

Boufayed

Teyssèdre

Laurent

et al. 2006

Journal of Applied Physics

164

130

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We introduce and develop two bipolar transport models which are based on appreciably different physical assumptions regarding the distribution function in the energy levels of trap states. In the first model, conduction is described by an effective mobility of the carriers and the accumulation of stored space charge is taken into account through a single trapping level. In the second model the hypothesis of an exponential distribution function of trap depth is made, with conduction taking place via a hopping process from site to site. The results of simulations of the two models are compared with experimental data for the external current and the space-time evolution of the electrical space charge distribution. The two descriptions are evaluated in a critical way, and the prospects for these models to adequately describe real systems are given.

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Description of charge transport in polyethylene using a fluid model with a constant mobility: fitting model and experiments

Cited by 159 publications

References 19 publications

An improved model to estimate trapping parameters in polymeric materials and its application on normal and aged low-density polyethylenes

An improved model to estimate trapping parameters in polymeric materials and its application on normal and aged low-density polyethylenes

Charge transport modelling in electron-beam irradiated dielectrics: a model for polyethylene

Models of bipolar charge transport in polyethylene

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