Cole-cole analysis and electrical conduction mechanism of N+ implanted polycarbonate

In this paper, we present the analysis of the dielectric (dielectric constant, dielectric loss, a.c. conductivity) and electrical properties (I-V characteristics) of pristine and nitrogen ion implanted polycarbonate. The samples of polycarbonate were implanted with 100 keV N+ ions with fluence ranging from 1 x 10(15) to 1 x 10(17) ions cm(-2). The dielectric measurements of these samples were performed in the frequency range of 100 kHz to 100 MHz. It has been observed that dielectric constant decreases whereas dielectric loss and a.c. conductivity increases with increasing ion fluence. An analysis of real and imaginary parts of dielectric permittivity has been elucidated using Cole-Cole plot of the complex permittivity. With the help of Cole-Cole plot, we determined the values of static dielectric constant(epsilon(s)), optical dielectric constant (epsilon(infinity)), spreading factor (alpha), average relaxation time (tau(0)), and molecular relaxation time (tau). The I-V characteristics were studied using Keithley (6517) electrometer. The electrical conduction behaviour of pristine and implanted polycarbonate specimens has been explained using various models of conduction. (C) 2014 AIP Publishing LLC.