Optical and dielectric studies for the determination of gap states of the 'polypyrrole'

The polypyrrole is a conducting polymer prepared by chemical route. The diffuse reflectance measured in the wavelength range (300-2500nm) permitted the calculation of the refractive index (n), extinction coefficient (k), dissipation factor (tan delta) and relaxation time (tau). The optical band gap (E-g) was evaluated from the dielectric and conductivity properties, and its value (1.01eV) was confirmed by using the Tauc relation.