Carrier Transport and Thermally Stimulated Depolarization Current in Iodine-Doped Poly(Vinyl Chloride)

摘要

DC measurements and thermally stimulated depolarization current (TSOC) of pure and iodine- doped poly(vinyl chloride) films have been studied. The transient current peaks were observed and explained in the light of space charge limited current (SCLC). The average values of drift mobility have been calculated in the order of= 10-11 cm2 V-I S-I and found to be strongly affected by the presence of iodine and the temperature. The dependence of electrical conductivity and activation energy upon the iodine concentration is explained on the basis of charge transfer complexes of interaction between iodine and polymeric molecules. TSOC studies revealed that the peak temperature shifted to higher values with increasing iodine concentration. The activation energies and relaxation parameters of the relaxation process were evaluated. Based on the results, the origin of the TSOC peak was attributed to a superposition of dipolar relaxation and space charge build up.