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A space charge trapping model and its parameters in polymeric material

A space charge trapping model and its parameters in polymeric material
A space charge trapping model and its parameters in polymeric material
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.
polymers, space charge, trap, ageing
1000-3290
017201-[6pp]
Liao, Ruijin
e10ba49b-110d-4e1d-a102-b1a4e4a0b7e2
Zhou, Tianchun
06b3b98e-f559-404d-902a-ab66a1fa3d28
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Yang, Lijun
da9c0071-a555-45cb-b5d6-274fbf2dcc0a
Liao, Ruijin
e10ba49b-110d-4e1d-a102-b1a4e4a0b7e2
Zhou, Tianchun
06b3b98e-f559-404d-902a-ab66a1fa3d28
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Yang, Lijun
da9c0071-a555-45cb-b5d6-274fbf2dcc0a

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].

Record type: Article

Abstract

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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Zhou_Tian_Chun_Acta_Phys._Sin.pdf - Accepted Manuscript
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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

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Date deposited: 11 Jun 2012 12:25
Last modified: 19 Jul 2019 21:59

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