Optical Properties of Hybrid PEDOT-PSS: ZnO Thin Film

Hybrid PEDOT-PSS:ZnO thin film have been prepared using drop casting method. The optical properties such as refractive index (n), extinction coefficient (k), reflectivity (R), optical dielectric loss, optical conductivity (sigma), dispersion energy (E-d), oscillator energy (E-0) and optical energy band gap (E-g) have been calculated in this paper. The determinations of optical constants have been made by applying the single-effective oscillator model proposed by Wemple and Didomenico Jr. We found that the reflectance is decreasing as the composition of ZnO increase. The refractive index of film also show significantly changes with the volume composition of ZnO. As the composition of ZnO increase, the refractive index shows the normal dispersion behavior. The extinction coefficient is decreasing with the increasing of wavelength, but as the wavelength increase from 400 nm until 700 nm, the extinction coefficient is also increasing. Both the real and imaginary part of the dielectric constant decrease as the photon energy increase. The oscillator energy E-o, dispersion energy E-d, optical band energy E-g were determined by using Wemple DiDomenico single-effective-oscillator model. It is shown that E-o is increasing as the composition of ZnO increase, E-d is decreasing as the composition of ZnO increase and E-g is increasing as the composition of ZnO increase. It is shown that the compositions of ZnO influence the optical properties of hybrid PEDOT-PSS:ZnO thin film.