The effect of TiO2 particle to the conductivity of polythiophene thin film

Abstract

This work focused on the study of electrical conductivity of titanium dioxide (Ti02) and Polythiophene (PT) thin film on Indium Tin Oxide (ITO) subtract. The layered ofTi02 and PT thin films with ratio 1:1, 1:5, 1:10, 5:1 and 10:1 was deposited on the ITO subtract by using spin coating technique. Ti02 solution with 3 different pH (pH 2, pH 7 and pH 12) was prepared by using electrochemical method to produce Ti02 particle. Structure and morpholology of Ti02 particle have been studied using XRay Diffraction (XRD) and Scanning Electron Microscope (SEM). The result shows Ti02 particle showed like plain surface for Ti02 particle with pH 2, while spherical particle were observed in Ti02 particles with pH 7 and rod like particle obtained for Ti02 particle with pH 12. From XRD, its shows that all of this Ti02 particles exhibit anatase phase. Ti02 particle with pH 12 was used as a layer on the thin film. The optical absorption of thin film was obtained from the UV-Vis spectrophotometer. The lowest energy gap is Ti02:PT thin film at the ratio 5: 1 which is 3. l 9e V. The electrical conductivity of the thin films was measured by using four point probes under dark and also under different light intensity ( 10, 30, 50, 80 and 100 wm- 2 ). Electrical conductivity under intensity of light shows that thin films with ratio 1 :5 has the highest intensity of light that is 0.337Sm-