Study the Effect of Annealing on the, Structural. and Optical Properties of Nano SnO2 Thin Films Prepared by Spray Pyrolysis Technical

Abstract

In this work, the effect of annealing temperature Ta
on the structural and optical properties of SnO2 nanostructure prepared by spray pyrolysis method was investigated. SnO2 films prepared on glass substrate with thickness 250 nm by dissolved 2.2563 g of SnCl2.2H2O in 100 ml of ethanol then added 60 drops from concentrated hydrochloric acid (HCl) . After that the films were annealed at various temperatures (573, 673 and 773 K). X-ray diffraction studies show that the structure of all SnO2 films ispolycrystalline with tetragonal rutile crystalline structure with preferential orientation in the (200) direction.
The optical measurement showed that the nature of the optical transition has been direct with average band gap energies have tendency to decreases from 3.98 eV to 3.73 eV with increasing of Ta
. The extent and nature of transmittance and optimized band gap of the material assure to utilize it for photovoltaic applications