Polarity reversal current transient investigations in cellulose acetate films

Polarity reversal transient currents in cellulose acetate films have been studied as a function of field, thickness and temperature. The current peaks have been observed in the current-time characteristics and these peaks may be attributed to the space charge injection from electrodes. The dependence of the transient current on thickness (I α d⁻³)of the sample justifies the existence of SCLC. The carrier mobility ∼(8.5 ± 0.05) × 10⁻¹⁰ cm2 V⁻¹ s⁻¹ has been estimated at room temperature. The mobility in iodine doped (2 /. wt/wt) sample has been found to be ∼ 9.5×10⁻⁸ cm² V⁻¹ s⁻¹. The sign of the injected carriers is determined by using blocking electrode method.