Investigating the Effect of Mo Doping on Properties of n-type ZnO Films

This paper focused on study of 100% ZnO and doped with Molybdenum (Mo) in different concentrations (0.25, 0.5 and 0.75%) deposited by spray pyrolysis method in order to study the effect of dopant on the structural, optical and electrical properties of ZnO with the aim of improving its properties for use as a conductive transparent electrode in thin-film solar cells. After the characterization of our films and the corresponding discussions, we can conclude that: the XRD analysis confirmed that the films made from undoped and Mo-doped ZnO are polycrystalline with a hexagonal structure of the Wurtzite type with an orientation preferential (002), with no other phase detected. The transmittance decreases with the addition of Mo to ZnO. Therefore, Mo does not improve the transmittance of ZnO for concentrations between 0.25% up to 0.75%. The electrical analysis shows that Mo affects the electrical properties of ZnO by increasing the electrical conductivity with a high value of 1.176 (Ω.cm)-1 for the ZnO:0.25%Mo film.