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|Title:||Pre-photoexcitation effects in 75 MeV oxygen ion irradiated kapton-H polyimide|
|Keywords:||Ion irradiation;Kapton-H;Pre-photoexcitation effects;Polymers|
|Abstract:||The pre-photoexcitation effect measured in the form of dark polarization (Id) under visible radiation in 75 MeV oxygen ion irradiated (Fluence: 1.8×10¹¹, 3.1×10¹² and 1.8×10¹³ ions/cm²) kapton-H polyimide has been investigated. The dependence of Id on exposure (ranging from 0 to 10000 W/m²) and the time interval Δt (ranging from 0 to 7 min) between the end of illumination and the outset of the polarizing electric field have been studied at operating temperatures of 80º and 200ºC under a biasing field of 240 kV/cm. The variation of Id with exposure shows a transitory saturation followed by a gradual descent. The band-band transition and the conversion of trapping sites into recombination centers have been held responsible for such behaviour. The ion irradiated samples, in general, show a decrease in Id as compared to pristine samples. The effect of fluence on Id is mainly associated with the enhancement of charge trapping density and the charge carrier mobility.|
|Appears in Collections:||IJPAP Vol.47(02) [February 2009]|
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