Different Composition Ratio of ZnO/CuO Nanocomposite Thin Film using Sol-gel Spin Coating Technique

Abstract

ZnO/CuO nanocomposite thin films were deposited at different ratio, 50:50, 60:40, 70:30, 80:20 and 90:10 using sol – gel spin coating technique on glass substrates. The thin films were annealed at 500°C for 1 hour at room ambient after the deposition process. The structural, optical and electrical properties of the thin films were characterized by Field Emission Scanning Electron Microscopy (FESEM), UV-Vis spectrophotometer, and 2-point probe I-V measurement system. The FESEM results showed the formation of ZnO/CuO nanoparticles shape, with the average particle size for each sample decreased with increased of ZnO ratio. The average transmittance of the thin films increased with increase of ZnO ratio, with the highest transmittance showed by 90:10 thin film with a value of 82.95%. Bandgap of the thin films were calculated and obtained using Tauc’s plot and were found between 3.29 to 3.90 eV. I-V characteristic showed that the highest current reading is at 50:50 ratio. The highest conductivity was achieved by 70:30 thin film with a value of 0.396 x 10-3 S/cm.