Combined effects of charging, electron irradiation and visible light on polyimide films
Résumé
Polyimide is widely used for spatial applications as it offers good thermal and electrical properties. In this paper an analysis of the photoconduction effect on charge transport in Kapton® HN films is proposed. Space charge distribution recorded by the Pulse Electro Acoustic Method and surface potential measurements may be explained by a simple model based on light absorption. Evidence is provided that, for strongly absorbed wavelengths, photoconductivity is leading to progressive charge injection, rather than charge vanishing under screening. A stable photoelectret may therefore be produced by light exposure on a charged sample. It may also be responsible for a strong return voltage effect on an apparently neutral film.
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