Optical, Electrochemical, and Structural Properties of Spray Coated Dihexyl Substituted Poly (3,4 Propylene Dioxythiophene) Film for Optoelectronics Devices

Abstract

The dihexyl substituted poly (3,4-propylenedioxythiophene) (PProDOT-Hx2) thin films uniformly deposited by cost effective spray coating technique on transparent conducting oxide coated substrates. The electro-optical properties of PProDOT-Hx2 films were studied by UV-Vis spectroscopy that shows the color contrast about 45% with coloration efficiency of ∼ 185 cm2/C. The electrochemical properties of PProDOT-Hx2 films were studied by cyclic voltammetry and AC impedance techniques. The cyclic voltammogram shows that redox reaction of films are diffusion controlled and ions transportation will be faster on the polymer film at higher scan rate. Impedance spectra indicate that polymer films are showing interface charge transfer process as well as capacitive behavior between the electrode and electrolyte. The XRD of the PProDOT-Hx2 thin films revealed that the films are in amorphous nature, which accelerates the transportation of ions during redox process.