R.Ghanim, I., M. R.Kahlil, and N. T. Shihab. “The Morphology, D.C Conductivity and Activation Energy of CdS:Zn Films Fabricated by Chemical Spray Pyrolysis”. Al-Qadisiyah Journal of Pure Science, Vol. 23, no. 1, May 2018, pp. 107 -11, doi:10.29350/jops.2018.23.1.723.