
Influence of Co doping content on its valence state in Zn1âxCoxO (0 â¤Â x â¤Â 0.15) thin films
Keywords: 73.61.Ga; 61.72.Vv; 82.80.Ej; 31.15.Rh; Zinc oxide; Cobalt doping; XPS; Valence state;