Space charge suppression induced by deep traps in polyethylene/zeolite nanocomposite

Han, Bai; Wang, Xuan; Zhi, Sun; Yang, Jiaming; Liu, Qingquan

doi:10.1063/1.4773918

Cited by 93 publications

(59 citation statements)

References 8 publications

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“…1,2 Generally, it is difficult for charge carriers to escape from the deep trap sites, due to the higher potential barrier, especially for nanodielectrics with high loading concentration, which is inconsistent with the observed conductivity phenomenon. The quantum tunneling mechanism based on the percolation theory has been investigated in black carbon and carbon nanotube polymer Electronic addresses: gc@ecs.soton.ac.uk and sli@mail.xjtu.edu.cn composites.…”

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confidence: 99%

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Charge transport model in nanodielectric composites based on quantum tunneling mechanism and dual-level traps

2016

Applied Physics Letters

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Charge transport properties in nanodielectrics present different tendencies for different loading concentrations. The exact mechanisms that are responsible for charge transport in nanodielectrics are not detailed, especially for high loading concentration. A charge transport model in nanodielectrics has been proposed based on quantum tunneling mechanism and dual-level traps. In the model, the thermally assisted hopping (TAH) process for the shallow traps and the tunnelling process for the deep traps are considered. For different loading concentrations, the dominant charge transport mechanisms are different. The quantum tunneling mechanism plays a major role in determining the charge conduction in nanodielectrics with high loading concentrations. While for low loading concentrations, the thermal hopping mechanism will dominate the charge conduction process. The model can explain the observed conductivity property in nanodielectrics with different loading concentrations.

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confidence: 99%

“…1,2 However, the effect of space charge suppression has a strong link with the nanoparticle concentration. For low loading concentration, the charge suppression can be observed clearly by the pulsed electroacoustic method (PEA), while charge transport behavior becomes more complicated for high loading concentration.…”

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confidence: 99%

Charge transport model in nanodielectric composites based on quantum tunneling mechanism and dual-level traps

2016

Applied Physics Letters

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“…TSC measurement has also confirmed the formation of deep trap after introducing nanoparticles as the TSC peak shifts from a lower temperature towards a higher temperature after introducing nanofillers [6].…”

Section: B Deep Traps and Evidencesmentioning

confidence: 76%

Space charge in nanodielectrics and its impact on electrical performance

Zhong

2015

2015 IEEE 11th International Conference on the Properties and Applications of Dielectric Materials (ICPADM)

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Abstract-Nanodielectrics have been actively investigated in last two decades as they have shown some improved dielectric properties that are important for high voltage insulation applications. One of these improvements is the reduction in space charge when the nanodielectrics are subjected to dc electric fields. The formation of deep trap after introducing nanoparticles in the material has been widely reported. However, the mechanisms that are responsible for the charge suppression are not detailed. More importantly, the effect of charge suppression is strongly dependent on the amount of nanoparticles, i.e. loading concentration. In the present paper, a schematic model has been proposed based on deep trap concept. A tunneling process has been introduced when the trapping sites become closer which is the case for high nanofillers concentration. Based on the new model, charge formation and dynamics in nanodielectrics with different loading concentrations can be estimated and electrical performance anticipated. A range of factors that can influence charge trapping/detrapping have been discussed.

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“…The results indicate that the peaks of the trap levels are in the range of 0.95-1.00 eV, which are assumed to be deep trapping sites and agree well with the previous results. (16,17) The , respectively. It is also shown that there are much fewer trapping sites in LD-S than in the other two groups, which might be related to the uniform cell size and the smaller crystal-amorphous interfacial regions.…”

Section: Effect Of Annealing Rate On Charge Injection and Transportmentioning

confidence: 99%

Transient Behavior of Space Charge in Heat-treated Low-density Polyethylene under Coupled fields

2017

Sensors and Materials

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Developing high-performance polyethylene-based insulating materials for high-voltage direct current (HVDC) application is still a great challenge owing to space charge effects especially under DC conditions. In particular, microscopic crystal-amorphous structures make the charge transport process more complex under coupled fields, i.e., electric, temperature, and mechanical fields. Here, we investigate the effect of heat treatment on the morphology and space charge behavior of low-density polyethylene (LDPE) under temperature fields ranging from 20 to 60 ℃ under a high external DC field of −100 kV/mm. The results show that better crystallization in LDPE was achieved with a lower annealing rate, and both the size and level of uniformity of spherulites increased. Positive and negative charge packets were observed and followed the fielddependent negative differential mobility (NDM) law, which were strongly affected by temperature. According to the change in trap property, the effect of crystal-amorphous regions is critical to long-range hole transport, because larger spherulites showed increased difficulty on interchain tunneling, reduced carrier mobility, and reinforced hole trapping.

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Space charge suppression induced by deep traps in polyethylene/zeolite nanocomposite

Abstract: Nanoparticle surface modification induced space charge suppression in linear low density polyethylene Appl. Phys. Lett. 95, 242905 (2009); 10.1063/1.3275732 Significant suppression of space charge injection into linear low density polyethylene by surface oxyfluorination

Cited by 93 publications

References 8 publications

Charge transport model in nanodielectric composites based on quantum tunneling mechanism and dual-level traps

Charge transport model in nanodielectric composites based on quantum tunneling mechanism and dual-level traps

Space charge in nanodielectrics and its impact on electrical performance

Transient Behavior of Space Charge in Heat-treated Low-density Polyethylene under Coupled fields

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