Photostimulated discharge of corona and electron-beam charged electret polymers

A. Mellinger, F. Camacho Gonzalez, R. Gerhard-Multhaupt, L. F. Santos, R. M. Faria

Research output: Contribution to conferencePaperpeer-review

7 Scopus citations


Despite the long-time use of space-charge electrets in various commercial applications, the mechanism of charge storage is still poorly understood. To study the energy distribution of deep traps, photostimulated discharge spectra of electron-beam and corona-charged polytetrafluoroethylene (PTFE), polyethylene terephthalate (PETP) and cellular polypropylene (PP) films were recorded for wavelengths between 200 and 400 nm. In addition, space-charge profiles were measured using the piezoelectrically generated pressure-step (PPS) method in order to monitor the detrapping process. Strong discharge currents of up to 15 pA/cm2 were found in PETP around the UV absorption edge near 310 nm. Initial results show a quantitative depopulation of near-surface charges, whereas only partial detrapping could be achieved for bulk charges. Three distinct trapping levels could be identified in PP films.

Original languageEnglish
Number of pages4
StatePublished - 2002
Event11th International Symposium on Electrets - Melbourne, VIC., Australia
Duration: Oct 1 2002Oct 3 2002


Conference11th International Symposium on Electrets
CityMelbourne, VIC.


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