Charge motion and trapping in insulators: surface and bulk effects

Wintle, H. J.

doi:10.1109/94.752003

Cited by 56 publications

(43 citation statements)

References 45 publications

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“…In part, this is not surprising. For example, Wintle, who states, "our basic knowledge is not in good shape", has pointed out that moving from a very simple system to even a slightly more complicated one causes huge problems in the analysis of an apparently simple space charge decay observation [56]. The simplest system might contain no permanent dipoles, only one carrier species, in which the carriers are all excess carriers.…”

Section: Space Charge Measurementmentioning

confidence: 99%

Ageing, Space Charge and Nanodielectrics: Ten Things We Don't Know About Dielectrics

Fothergill

2007

2007 IEEE International Conference on Solid Dielectrics

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Three areas of considerable progress are identified in the area of polymeric insulation since the mid 1990s (i.e. since the inception of the Eric O. Forster Memorial Lectures): the understanding of ageing, the measurement of space charge, and the development of nanodielectrics. The paper proposes a typology to distinguish and define electrical ageing, degradation and breakdown. With reference to the principal theories of thermo-ageing, it is concluded that there is little direct evidence for ageing even though it is likely to exist, at least above a critical field. The capability to measure space charge has improved considerably and this shows considerable potential as a diagnostic tool. Space charge behaviour is extremely difficult to analyse and general predictions may be impossible in practice. It is, however, necessary to control space charge accumulation in HVDC systems. Nanodielectrics continue to offer promise and understanding is improving in this area, particularly in the development of models of interaction zones around nanoparticles.

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Section: Space Charge Measurementmentioning

confidence: 99%

Ageing, Space Charge and Nanodielectrics: Ten Things We Don't Know About Dielectrics

Fothergill

2007

2007 IEEE International Conference on Solid Dielectrics

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“…High field conduction in PE is dominated by electronic carriers (holes and electrons) [2], the injection of which is usually described by the Schottky or the Fowler-Nordhiem injection mechanisms [1,9]. For PE, the experimental barrier to charge injection from a metallic electrode is about 1 eV [1], which is much smaller than theoretical estimates.…”

Section: Introductionmentioning

confidence: 96%

“…Due to the constant drive for higher design fields in industrial applications and the need for reliability as well as longer operating life, a comprehensive understanding of high field phenomena in insulating polymers is increasingly important. However, a rigorous explanation of the physical basis of high field conduction in common insulating polymers, such as polyethylene (PE), has yet to be achieved [1][2][3][4]. The key to a rigorous understanding of high field conduction is an atomic level understanding of charge transport in the bulk, which has been addressed previously by the authors [5][6][7], and the source of charge for conduction, in the context of charge injection at the electrode/polymer interface.…”

Section: Introductionmentioning

confidence: 99%

Quantum mechanical study of charge injection at the interface of polyethylene and platinum

Huzayyin

Boggs

Ramprasad

2011

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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Charge injection at a polyethylene/platinum interface is studied through use of density functional theory (DFT). Various crystal orientations at the interface heterostructure are considered. The computed minimum barriers for electrons and hole injection at an impurity free interface are 3.15 and 2.62 eV, respectively. The work demonstrates that chemical impurities play an important role in the injection process. Impurity states, such as those of carbonyl, can reduce the effective barriers to charge injection to about 1.0 eV.

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“…A survey of the literature suggests that several significant attempts [7][8][9][10] have been made earlier to understand the relation 978-1-4673-2851-71121$31.00 ©20121EEE between conduction and space charges. However, often, in analytical treatments, contribution of diffusion to the continuity equation was neglected for some reason [7][8]. In fact, incorporation of diffusion in continuity equation results in additional derivative term for which an analytical solution is complicated.…”

Section: Introductionmentioning

confidence: 99%

Effect of diffusion on space charge formation in dielectrics under steady-state DC conditions

Reddy

2012

2012 IEEE 10th International Conference on the Properties and Applications of Dielectric Materials

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Despite copious experimental results, space charge formation in dielectrics is yet to be understood. Dynamics of current conduction across dielectric specimen is attributed for the formation of different types of space charges. However, analytical treatment of relation between conduction and different types of space charge formation is scanty in the literature. As a first step, the author presents analytical solutions to the steady-state dc problem including the effect of diffusion. The author's solutions throw light on certain experimentally observed space charge phenomena in LDPE and found to match with experimental results available in the literature. Several interesting results/observations are presented in the paper.

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Charge motion and trapping in insulators: surface and bulk effects

Cited by 56 publications

References 45 publications

Ageing, Space Charge and Nanodielectrics: Ten Things We Don't Know About Dielectrics

Ageing, Space Charge and Nanodielectrics: Ten Things We Don't Know About Dielectrics

Quantum mechanical study of charge injection at the interface of polyethylene and platinum

Effect of diffusion on space charge formation in dielectrics under steady-state DC conditions

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