Open AccessTrap capture properties of space charge and void breakdown charge in a cellular polypropylene electret film
Author(s) -
Min Zhao,
Zhenlian An,
Junlan Yao,
Changsheng Xie,
Zhang Xia
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.482
Subject(s) - electret , void (composites) , space charge , materials science , surface charge , polypropylene , trapping , composite material , surface layer , charge density , molecular physics , layer (electronics) , chemistry , physics , ecology , quantum mechanics , biology , electron
The following aspects have been indicated by systematic studies on the cellular polypropylene (PP) electret film. Trap capture properties of space charges changed with their injected amount or surface potential of the sample. The space charges were captured largely in the deep traps of the sample surface and the second-deep traps of the near-surface region at small amount of charge injection. They would fill these traps in the surface layer (surface and near-surface region) and the shallow traps in bulk at the same time in the case of greater amount of charge injection. The charge detrapping temperatures of the three kinds of trap centers are about 160℃138℃ and 92℃respectively. The charges formed due to void breakdown (called the void breakdown charges) were captured not only in the surface layers of voids which have similar traps as the surface layer of the samplebut also there were numerous void breakdown charges which penetrated the void surface layerentered into the bulkand were captured by the shallow bulk traps.