Rotational speed and solvent effect in the structural and optical properties of ZNO thin films prepared by SOL-GEL (spain coating) method

Abstract

In this work we have studied the impact of the type of solvents and the rotational speed on the properties of the ZnO thin films prepared by Sol Gel (Spin Caoting) method. The Motivation for the use of this method is the simplicity and the ease of preparation. The solutions were obtained by dissolving 3.2925 g of zinc acetate (ZAD ) in 20 ml of ethanol ( Eth ) or propa- nol (Propa) and adding 1.8 ml of this monoethanolamine. The MEA facilitate the solubility of the zinc acetate .The concentration of the solution became 0.75 mole / l , and the ratio of ZAD to MEA is 2. For the first solution ( ethanol solvent) , the speeds were limited between 2000 rpm and 4000 rpm ,with incre- ment of 500 rpm , fore second solution, the speeds were between 350 rpm and 950 rpm with increment of 150 rpm , with fixing the rest of parameters . In order to determine the impact of these two factors on the properties of these films , we have studied the struc- tural and optical properties of these thin films by using x-ray diffraction (XRD), and optical spectroscopy.