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Charge trapping and detrapping in polymeric materials: Trapping parameters

Charge trapping and detrapping in polymeric materials: Trapping parameters
Charge trapping and detrapping in polymeric materials: Trapping parameters
Space charge formation in polymeric materials can cause some serious concern for design engineers as the electric field may severely be distorted, leading to part of the material being overstressed. This may result in material degradation and possibly premature failure at the worst. It is therefore important to understand charge generation, trapping, and detrapping processes in the material. Trap depths and density of trapping states in materials are important as they are potentially related to microstructure of the material. Changes in these parameters may reflect the aging taken place in the material. In the present paper, characteristics of charge trapping and detrapping in low density polyethylene (LDPE) under dc electric field have been investigated using the pulsed electroacoustic (PEA) technique. A simple trapping and detrapping model based on two trapping levels has been used to qualitatively explain the observation. Numerical simulation based on the above model has been carried out to extract parameters related to trapping characteristics in the material. It has been found that the space charge decaying during the first few hundred seconds corresponding to the fast changing part of the slope was trapped with the shallow trap depth 0.88 eV, with trap density 1.47 × 1020 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 was trapped with the deep trap depth 1.01 eV, with its trap density 3.54 × 1018 m-3. The results also indicate that trap depths and density of both shallow and deep traps may be used as aging markers as changes in the material will certainly affect trapping characteristics in terms of trap depth and density.
ageing, crystal microstructure, electric field effects, numerical analysis, polymers, pulsed electroacoustic methods, space charge
0021-8979
3626468
Zhou, Tian-chun
1c1dfb73-40c5-4863-8b38-5e8992f2a710
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Liao, Rui-jin
28ed82e4-3309-4b40-ae2e-dc973bf2ff75
Xu, Zhiqiang
797f8b0e-a035-4cf9-ac3f-99098a3fdb50
Zhou, Tian-chun
1c1dfb73-40c5-4863-8b38-5e8992f2a710
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Liao, Rui-jin
28ed82e4-3309-4b40-ae2e-dc973bf2ff75
Xu, Zhiqiang
797f8b0e-a035-4cf9-ac3f-99098a3fdb50

Zhou, Tian-chun, Chen, George, Liao, Rui-jin and Xu, Zhiqiang (2011) Charge trapping and detrapping in polymeric materials: Trapping parameters. Journal of Applied Physics, 110 (4), 3626468.

Record type: Article

Abstract

Space charge formation in polymeric materials can cause some serious concern for design engineers as the electric field may severely be distorted, leading to part of the material being overstressed. This may result in material degradation and possibly premature failure at the worst. It is therefore important to understand charge generation, trapping, and detrapping processes in the material. Trap depths and density of trapping states in materials are important as they are potentially related to microstructure of the material. Changes in these parameters may reflect the aging taken place in the material. In the present paper, characteristics of charge trapping and detrapping in low density polyethylene (LDPE) under dc electric field have been investigated using the pulsed electroacoustic (PEA) technique. A simple trapping and detrapping model based on two trapping levels has been used to qualitatively explain the observation. Numerical simulation based on the above model has been carried out to extract parameters related to trapping characteristics in the material. It has been found that the space charge decaying during the first few hundred seconds corresponding to the fast changing part of the slope was trapped with the shallow trap depth 0.88 eV, with trap density 1.47 × 1020 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 was trapped with the deep trap depth 1.01 eV, with its trap density 3.54 × 1018 m-3. The results also indicate that trap depths and density of both shallow and deep traps may be used as aging markers as changes in the material will certainly affect trapping characteristics in terms of trap depth and density.

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Published date: 31 August 2011
Keywords: ageing, crystal microstructure, electric field effects, numerical analysis, polymers, pulsed electroacoustic methods, space charge
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 272732
URI: http://eprints.soton.ac.uk/id/eprint/272732
ISSN: 0021-8979
PURE UUID: e01694a1-3c33-446b-9554-0fa9b564be6a
ORCID for Zhiqiang Xu: ORCID iD orcid.org/0000-0002-6640-7335

Catalogue record

Date deposited: 01 Sep 2011 08:27
Last modified: 18 Feb 2021 17:14

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Contributors

Author: Tian-chun Zhou
Author: George Chen
Author: Rui-jin Liao
Author: Zhiqiang Xu ORCID iD

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