Abstract
The effect of high-energy ion irradiation on the steady-state conduction behaviour of polyetherimide (PEI) has been investigated. PEI samples of 25 μm thickness were irradiated with 100 MeV Ag ions (fluences of 5.6×1010, 1.8×1011 and 1.8×1012 ions/cm2) at the Inter University Accelerator Centre, New Delhi. Measurements under steady-state conditions at different temperatures (40–250 °C) were made at different electric fields ranging from 40 to 600 kV/cm. The ionic jump distance estimations indicate the possibility of ionic conduction at low and moderate temperatures. At high temperatures, the Schottky and Poole–Frenkel-type conduction mechanisms occur, depending on the fluence of irradiance. A decrease in charge carrier mobility (μ) with field has been associated with the radiation-induced disorders in PEI. An anomalous variation in μ with fluence shows the occurrence of a secondary radiation-induced crystalline phase. The activation energies were determined to be 0.05 and 2.3 eV below and above the glass transition, temperature, indicating the presence of more than one type of trapping centre in irradiated PEI.
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