Opto-electrical properties of Ni and Mg co-doped CdS thin films prepared by spin coating technique
T. Garmim, E Bouabdalli, L. Soussi, Z. El Jouad, Redouane Mghaiouini, A. Louardi, Bouchaíb Hartiti, Mohamed El Jouad, Mohamed Monkade
Abstract
Abstract In the presented study, (Ni, Mg) co-doped CdS thin films are synthetized using the spin coating method. The Mg incorporation effect on the structural, opto-electrical quality of Cd 0.98 Ni 0.02 S with different Mg concentrations (0 wt%, 1wt.%, 3wt, and 5wt.%) are investigated. A polycrystalline nature with a cubic structure oriented to (1 1 1) plane was confirmed by the DRX technique, and the incorporation of Mg in Cd 0.98 Ni 0.02 S causes an increase of the grain size. The SEM study exhibits a surface of deposited films is dense and the EDS spectra confirmed the existence of the doped elements. The optical properties show that the doping with 3 at.% of Mg presents the maximum each a value of 90% in visible range, with an increasing in the gap energy from 2.42 eV to 2.49 eV corresponding to increasing of Mg concentration. And also optical parameters were investigated such as α , k, n, ε r , ε i , tan δ , σ . The electrical resistivity and conductivity measurements are carried using the four points probe, we find that the electrical resistivity decreases from the 7.30 × 10 3 (Ohm. cm) to 4.28 × 10 3 (Ohm. cm) while Mg concentration increases from 0 at% to 5 at%.