The effect of Mn-doping on the vacuum deposited CdS thin films was investigated by studying the changes in the structural, optical and magnetic properties of the films. A thin Mn layer evaporated onto the CdS film surface served as the source layer for the diffusion doping. Doping was accomplished by annealing the CdS/Mn stack layers at 300 to 400C, in steps of 50C, for 30min under vacuum. The X-ray diffraction results showed that the undoped CdS film had a zinc-blende structure with a strong preferred orientation along the (111) direction. The incorporation of Mn did not cause any change in the texture but reduced the peak intensity and led to a smaller crystallite size. Investigation of surface morphology using atomic force microscopy confirmed the decrease in the grain size with the Mn diffusion. In addition, a more uniform grain size distribution was observed in the doped films. X-ray photoelectron spectroscopy analysis showed that Mn atoms on the surface of the films were bounded to either sulphur or oxygen atoms. Auger electron spectroscopy of the diffusion-doped CdS sample at 350C indicated that the atomic Mn concentration was higher close to the surface region and Mn was distributed with a steadily decreasing profile through the bulk of the film with an average atomic concentration value around few percent. Band gap energy of the undoped sample decreased from 2.42 to 2.36eV upon Mn diffusion at 400C. The magnetization of films as a function of magnetic field and temperature were measured. Clear ferromagnetic loops were observed for the Mn diffusion-doped CdS films prepared by annealing above 350C.

Structural, Optical and Magnetic Properties of Mn Diffusion-Doped CdS Thin Films Prepared by Vacuum Evaporation. S.Aksu, E.Bacaksiz, M.Parlak, S.Yılmaz, I.Polat, M.Altunbaş, M.Türksoy, R.Topkaya, K.Özdoğan: Materials Chemistry and Physics, 2011, 130[1-2], 340-5