Production of High Quasipermanent Charge Densities on Polymer Foils by Application of Breakdown Fields

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Abstract
Charge deposition on 2–25‐μ m polyethylene terephthalate (PET), polyfluoroethylenepropylene (FEP), and polycarbonate (PC) foils by application of fields up to, and exceeding breakdown strength in the polymers is reported. The greatest negative or positive charge densities on PET foils metalized on one side are in excess of 10−6 C/cm2, corresponding to full‐trap densities of about 4×1016 cm−3 and are thus considerably greater than the largest densities obtained previously on polymer foils with a variety of charging methods. The charge decay is nonexponential with time ``constants'' on PET and FEP in dry atmosphere exceeding 10 years at charge levels of 10−7 C/cm2. Analysis of thermally stimulated currents indicates that electrons in PET are subject to considerable retrapping.

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