In this work, a copper oxide thin films were deposed by a simple and inexpensive technique (spray pyrolysis) on substrates in ordinary glass at a fixed temperature T=500°C. Cu(NO₃)₂, 6H₂O was used as a basis of copper and dissolved in two different solvents (Water, Methanol) to give solutions S₁ and S₂ respectively with a concentration C_S1 = C_S2 = 0.5M.

The spray pyrolysis deposition made at different volumes 15, 30 and 45 ml of S₁ or S₂ on the glass substrates. The structural, morphological and optical properties of thin films of CuO were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-vis spectrophotometry. The X-ray diffraction patterns confirm the presence of the polycrystalline phase of CuO as monoclinic crystal structure with preferential orientation along (110), (002), (111) and (020). Their optical band gaps ranged from 3.95 to 4.02eV for thin films made with S₁, and from 1.6 to 1.95eV for thin films made with S₂ with a high absorbency in the visible region, which is in agreement with the values of the literature.