TSDC and Dielectric Relaxation Study of Pure and Malachite Green Doped Polyvinyl Carbazole Samples

The TSDC and dielectric behavior of solution grown films of pure and malachite green doped polyvinyl carbazole (PVK) samples has been studied as a function of temperature (40–70°C) and audio frequency range 500 Hz-20 kHz. When solid polymeric materials are subjected to electric field, an induced electric moment is produced. This induced electric moment persists, whenever the field is present. In case, when permanent dipoles are present, an electric field brings about their orientation and the material gets polarized. The displacement of polar groups require some time and is thus dependent on frequency and temperature, which lead to different dispersion phenomena. The dielectric constant of pure and malachite green doped PVK decreases with increasing frequencies at constant temperatures, however with increasing temperature the value of dielectric constant increases. This variation suggests the net effect of some internal field within the polymer along with the external ac field. The role of dopant in the polymer matrix and modification in the dielectric behavior are studied. Doping with malachite green is found to affect the magnitudes. The effect of malachite green is explained in terms of formation of charge transfer complex.