Hydrogenation effect on electrical, optical and magnetic properties of ZnSe/Co bilayer DMS thin films

This paper reports ZnSe/Co bilayer diluted magnetic semiconductor thin films have been prepared by using thermal evaporation technique. The bilayer DMS thin films were hydrogenated at different pressures (15-45 psi) for a constant time of 30 min. Before and after hydrogenations of these bilayer thin films the electrical, optical and magnetic properties have been investigated. Electrical resistivity and optical band gap were found to be increased with respect to hydrogenation pressure. X-ray diffraction (XRD) and magnetic measurements confirmed the formation of DMS ZnSe/Co bilayer DMS thin films. Raman spectra show the presence of hydrogen in these thin films. Surface topography study of as-grown, annealed and hydrogenated ZnSe/Co bilayer thin films indicates uniform deposition, mixing of layers and increment in roughness at the surface due to hydrogen passivation effect respectively. (C) 2010 Elsevier Ltd. All rights reserved.