Abstract
The effect of iodine doping on the photoconduction behaviour of pristine and 75 MeV oxygen ion-irradiated (fluence: 3.12×1012 ions/cm2) kapton-H polyimide film in the visible region has been investigated for different doping hours at various operating temperatures ranging 40–250°C and at different electric fields (40–400 kV/cm). The formation of charge transfer complexes in polymers effectively decreases the trapping sites by handling the charge carriers. A decrease in the photocurrent in ion-irradiated samples at higher exposure time for iodine vapours as compared with pristine samples has been associated with the enhancement in the trapping sites which may deplete the charge carriers and a loss in the photoactive groups owing to radiation-induced demerisation. The evidence of Frankel-type conduction (based on the estimation of Schottky coefficients) mechanism in irradiated samples is observed. A strong dependence of photocurrent on temperature in doped pristine and ion-irradiated samples reconfirms the thermal ionisation process of exciton for photogeneration of charge carriers.
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