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A space charge trapping model and its parameters in polymeric material

Record type: Article

In this paper, characteristics of charge trapping and detrapping in low density polyethylene under dc electric field are investigated using the pulsed electroacoustic technique. It is found that the charge decay shows very different features for the samples with different periods of applied electric field. A simple trapping and detrapping model based on two trapping levels is proposed to qualitatively explain the observation. At the same time, numerical simulation based on the above model is carried out to extract parameters (trap depths and concentration related to the material. It is found that the space charge decaying in the first few hundred seconds, corresponding to the fast changing part of the slope, is trapped in a shallow trap with a depth in a range between 0.77 and 0.81 eV, and the trapped charge density reaches (1.168–1.553) ×E19 m?3 in the sample volume measured. At the same time, the space charge that decays at longer time, corresponding to the slower part of the slope, is trapped in a deep trap with a depth in a range of 0.96 and 1.01 eV, and the trapped charge density is (1.194–4.615) ×E18 m?3. The trap depths and charge densities of both shallow and deep traps may increase with ageing, and the parameters of two energy wells can be used as an indication of the material aging.

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Citation

Liao, Ruijin, Zhou, Tianchun, Chen, George and Yang, Lijun (2012) A space charge trapping model and its parameters in polymeric material Acta Physica Sinica, 61, (1), 017201-[6pp].

More information

Published date: 5 January 2012
Additional Information: In Chinese
Keywords: polymers, space charge, trap, ageing
Organisations: EEE

Identifiers

Local EPrints ID: 340069
URI: http://eprints.soton.ac.uk/id/eprint/340069
ISSN: 1000-3290
PURE UUID: 4a23e591-74e6-4c16-aa38-4ce1c192bbf8

Catalogue record

Date deposited: 11 Jun 2012 12:25
Last modified: 18 Jul 2017 05:50

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Contributors

Author: Ruijin Liao
Author: Tianchun Zhou
Author: George Chen
Author: Lijun Yang

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