Study the effect of annealing on the Structural and Optical properties of Copper oxide films prepared by Sol-Gel Spin Coating

Abstract

This research is to study the effect of annealing on the structural and optical properties on the thin films copper oxide(CuO,Cu2O) was deposited on glass substrate by using technique Spin-Coating (Sol-Gel) with speed (3000 RPM) during the time of the deposition (30 sec). Was the preparation of the solution using a material of copper acetate (Cu(C2H3O2)2.H2O) as a basis and Diethanolamine (DEA) (C4H11NO2) as installed and Ethanol (C2H6O) as a solvent, the solution prepard at a concentration of 0.2M. The annealing at temperatures (250,350, 450,550)°C for one hour. We have investigated the Structural characteristics using (XRD and AFM) analyses ,from of (XRD) analyses show that the thin films are polycrystalline and annealing the films at 350 °C completely converts these films to tenorite structure with composition of CuO. And from (AFM) analyses show that the grian size increases with increasing annealing temperature. Either optical characteristics by spectroscopy UV in the range of wavelength (300-1100) nm. It is observed that the transmittance and allowed direct optical band gap of the films decreases with the increase of annealing temperature from 4.0 eV to 3.92 eV.