Abstract
Pure Tin Oxide (SnO2) and Magnesium (Mg) doped SnO2 thin films have been deposited onto glass substrates by spray pyrolysis technique at the substrate temperature of 450°C. The doping concentration of Mg was varied from 1 to 9 wt% (with 2 wt% step) while all other deposition parameters such as substrate temperature, spray rate, carrier gas pressure and distance between spray nozzle to substrate were kept constant. The surface morphology and optical properties of the deposited thin films have been studied by Scanning Electron Microscopy (SEM) and UV visible spectroscopy. Average optical transmittance in the 400–900 nm range varies from 18.21% to 58.99% with varying Mg concentration in the film. Maximum band gap value of 3.90 eV is obtained for undoped SnO2.
Highlights
In recent years, there has been considerable interest in metal oxides because of their many industrial applications, especially transparent conducting oxides (TCO)
The optical band gap of undoped SnO2 thin film is 3.90 eV and it decreases with increasing Mg doping concentration except 5wt% doping level whereupon Eg increases up to 3.88eV and it decreases gradually again (5 to 9 wt%)
Effect of Mg-doping on the properties of SnO2 thin films prepared by the spray pyrolysis method was studied by varying the dopant concentration
Summary
There has been considerable interest in metal oxides because of their many industrial applications, especially transparent conducting oxides (TCO). Abdul Rahman Abdul Aziz Sakhta et al.: Morphological and Optical Properties of Pure and Mg Doped Tin Oxide The structure of this material in its bulk form is tetragonal with lattice parameters of a = b = 4.737 A° and c = 3.186 °A. There are many characteristics of this method such as: it is suitable for preparing doped and pure thin films because of their simple experimental manufacturing, we can prepare films from high melting temperature materials that we can’t prepare in other methods, economic technique because the used devices don’t need vacuum or complicated devices, we can add several dopants that are different in concentration, we can change deposition factors (type of used substrates – temperature of substrate – composition of solution – flow rate solution – distance between the spray nozzle and substrate) to get films that have special electrical and optical properties [11].
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