A space charge trapping model and its parameters in polymeric material


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].

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Description/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.

Item Type: Article
Additional Information: In Chinese
ISSNs: 1000-3290 (print)
Related URLs:
Keywords: polymers, space charge, trap, ageing
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
T Technology > TP Chemical technology
Divisions: Faculty of Physical Sciences and Engineering > Electronics and Computer Science > EEE
ePrint ID: 340069
Date Deposited: 11 Jun 2012 12:25
Last Modified: 27 Mar 2014 20:22
Further Information:Google Scholar
ISI Citation Count:0
URI: http://eprints.soton.ac.uk/id/eprint/340069

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