TSD current studies of iodine-doped polyvinyl-acetate thin films

Abstract

TSD current studies of thin films (thickness approximately 7000 AA) of iodine-doped polyvinyl-acetate have been made as a function of the polarizing field Ep. Polarized PVAc:I2 films exhibit two TSD peaks at 327 and 398K with activation energies of 0.19 and 0.27 eV. At 300K, they show relaxation times of 8.40*102 and 6.54*103 s respectively. The magnitude of the 327K peak increases with the increase of Ep from 0 to 1 kV cm-1. Above this value of Ep, the peak starts decreasing and ultimately vanishes for Ep>or approximately=7 kV cm-1. However, the 398K peak continues to increase as Ep increases from 0 to 9 kV cm-1. Only one TSD peak (at 398K) has been observed in unpolarized PVAc:I2 films. This has been attributed to the formation of the charge-transfer complexes between iodine and the main molecular chain of PVAc.