Contribution of space charge polarization in thermally poled iodine-doped polystyrene

Short-circuit thermally stimulated current (TSC) measurements have been made on thermally polarized foils. The results indicated that the electret state of these samples is due to dipolar orientation and charge trapping. Iodine doping has been found to form a charge transfer complex and hence to modify the electret state of the samples significantly. Higher concentration of doping and charging at higher temperatures has been found to favor charge carrier trapping in energetically deeper traps. An anomalous peak observed in strongly doped samples polarized at higher temperatures is considered to be due to detrapping of carriers from such deeper traps.<
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