Charge transport properties of dielectrics revealed by isothermal surface potential decay

Min, Daomin; Cho, Mengu; Khan, Arshad M.; Li, Shengtao

doi:10.1109/tdei.2012.6260024

Cited by 71 publications

(25 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A thoroughly understanding of space charge behavior on the surface and in the bulk of insulating materials is of importance, e.g., improving the performance of diverse applications and furthermore in reducing safety hazards from or avoiding damage to electronic and electrical equipments [4][5]. Due to the special aggregation structure of polymeric materials, both physical defects in amorphous region and chemical defects like chemical tails of macromolecular chains can lead to the formation of traps.…”

Section: Introductionmentioning

confidence: 99%

The energy distribution of trapped charges in polymers based on isothermal surface potential decay model

Zhou

Min

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

Self Cite

162

View full text Add to dashboard Cite

Space charge formation in polymeric materials can cause some serious concern in real operation, because it has significant influence on the performance of polymers. For example, space charge in some insulating materials can severely distort the electric field, even lead to materials degradation. On the contrary, in the case of its applications, space charge stored in electrets can greatly improve their properties. It is therefore important to understand trapped charge distribution in materials as it is considered to be a novel indicator for effective evaluation of aging status and electric withstanding strength of insulating materials. In this paper, a model based on isothermal surface potential decay (ISPD) is proposed to study the distribution of trapped charges by considering the physical mechanism of the detrapping process. By measuring the ISPD characteristics of polymeric materials and fitting the data according to the assumption of shallow and deep traps, the distribution of trapped charges is obtained, which may be related to the change of aggregation structure of polymers. In order to verify the model, it is used to analyze different ISPD decay curves of polypropylene (PP) and low density polyethylene (LDPE), as well as the ISPD data of PP electrets with/without pressure expanding treatment. The results show that the proposed ISPD model is effective and convenient. Two peaks are observed on the curve of the trapped charge density versus the trap level. The obtained distribution of the trapped charges in polymers can reveal the different nature of electron/hole traps and the different transportation behavior of hole/electron carriers, i.e., the electron-type traps show an inter-chain character while the character of hole-type traps is intra-chain. In addition, the distribution of trapped charge is further related to aggregation structure of PP and LDPE, as well as PP electrets with/without pressure expanding treatment.Index Terms -Space charge, isothermal surface potential decay (ISPD), trapped charge density, aggregation structure.

show abstract

Section: Introductionmentioning

confidence: 99%

The energy distribution of trapped charges in polymers based on isothermal surface potential decay model

Zhou

Min

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

Self Cite

162

View full text Add to dashboard Cite

show abstract

“…According to [46], we set μ ≈ 3.15 × 10 −16 m 2 ·V −1 ·s −1 and μ/P tr ≈ 2.27 × 10 −13 m 2 ·V −1 in the following simulations. In addition, the deeptrap density is assumed as 208 C·m −3 (or 1.3 × 10 21 m −3 ) in this paper [13], [23], [48].…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

“…Fitting the SPD curves by the charge depolarization and conduction model, they found that the ohmic resistivity of polyimide is several order higher than the results obtained by the ASTM method. Min et al [12], [13] also developed a SPD method to reveal the charge transport properties of insulators, which found that the ohmic resistivity of polyimide was in the order of 10 17 ·m.…”

Section: Introductionmentioning

confidence: 99%

Investigation Into Surface Potential Decay of Polyimide by Unipolar Charge Transport Model

Min

Cho

et al. 2013

IEEE Trans. Plasma Sci.

View full text Add to dashboard Cite

To predict spacecraft charging levels and mitigate electrostatic discharges, it is very important to understand the charge transport properties of highly insulating materials such as polyimide. The combination of surface potential decay (SPD) experiment and unipolar charge transport (UCT) model investigates the charge transport properties of polymide. In a simulated space environment chamber, the SPD experiments are performed on polymide. After irradiated by electron beams, the surface potential distributions of the sample are measured by a noncontact potential probe (Trek). The UCT model that consists of relaxation polarization, charge injection, charge migration, charge trapping, and detrapping processes simulates the SPD results. In the numerical UCT model, we solve the charge continuity equation by Runge-Kutta discontinuous Galerkin method and Poisson's equation by boundary element method. The least square error between the experimental and the simulated SPD results is searched by genetic algorithm (GA). From the GA calculation, we optimize the charge transport parameters of polyimide. Then, we calculate the space charge evolution properties during the SPD process of polyimide by the UCT model. These charge transport parameters, then, can be used to study the surface charging or deep dielectric charging of the insulator.Index Terms-Charge transport properties, polyimide, surface potential decay (SPD), unipolar charge transport (UCT).

show abstract

“…Li et al reported the charge transport of epoxy resin/glass composition (FR4), polytetrafluoroethylene and polyimide. Their focus was on evaluating spacecraft charging, and predicting surface and internal electrostatic discharging [12]. Laurent et al reported that charge transport and trapping in lowdensity polyethylene was influenced by surface states.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Charge Accumulation and Decay on Silicone Rubber/SiO₂Nanocomposite Surface

Liu¹,

Li²,

Du³

2016

Journal of Electrical Engineering and Technology

View full text Add to dashboard Cite

-The accumulation and decay of surface charge on silicone rubber (SiR)/SiO 2 nanocomposites under a unipolar corona discharge field was investigated. The effect of the weight ratio of SiO 2 nanoparticles from 0.1 to 0.7 wt.% was studied. Attenuated total reflection infrared spectra of the SiR/SiO 2 nanocomposites indicated that the SiO 2 nanoparticles chemically and physically interacted with the SiR matrix. This facilitated the SiR chains in restricting the injection of surface charge into the bulk nanocomposite. SiR composites containing SiO 2 nanoparticles (especially that containing 0.1 wt.% SiO 2 ) exhibited significantly reduced surface discharge. This approach may have application in outdoor SiR electrical insulators.

show abstract

Charge transport properties of dielectrics revealed by isothermal surface potential decay

Cited by 71 publications

References 41 publications

The energy distribution of trapped charges in polymers based on isothermal surface potential decay model

The energy distribution of trapped charges in polymers based on isothermal surface potential decay model

Investigation Into Surface Potential Decay of Polyimide by Unipolar Charge Transport Model

Kinetics of Charge Accumulation and Decay on Silicone Rubber/SiO₂Nanocomposite Surface

Contact Info

Product

Resources

About

Charge transport properties of dielectrics revealed by isothermal surface potential decay

Cited by 71 publications

References 41 publications

The energy distribution of trapped charges in polymers based on isothermal surface potential decay model

The energy distribution of trapped charges in polymers based on isothermal surface potential decay model

Investigation Into Surface Potential Decay of Polyimide by Unipolar Charge Transport Model

Kinetics of Charge Accumulation and Decay on Silicone Rubber/SiO2Nanocomposite Surface

Contact Info

Product

Resources

About

Kinetics of Charge Accumulation and Decay on Silicone Rubber/SiO₂Nanocomposite Surface