Abstract
High-energy ion irradiation effects on the thermally stimulated depolarization current (TSDC) behaviour of kapton-H samples (12.5 μm) irradiated with 50 MeV Li ion (fluence 5 × 10 4, 10 5 and 5 × 10 5 ions/cm 2) have been investigated. The TSDC spectra of the irradiated samples reveal that the β-peak (appearing around 80–110 °C) associated with dipolar relaxation has been significantly affected owing to the demerization of carbonyl groups due to irradiation. The TSDC spectra also reveal a new relaxation process (termed as γ-relaxation) around 30 °C, due to increased water absorptivity in irradiated samples. The peak around 200 °C (α-peak) associated with space charge relaxation process also shows a behavioural change with ion irradiation. The peak not only shifts towards the higher temperature with increasing fluence but also show an increase in its activation energy (0.33–0.99 eV) with increasing polarizing field. The creation of new deep energy trap centers due to the formation of conjugated bonds after irradiation is responsible for this modification. The Cole–Cole distribution curves show the formation of new sub-polar group with different characteristic relaxation time.
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