Mahewara, R. B., and L. S. . Ravangave. “Effect of Copper Concentration on Structure Morphology and Optical Band Gap of Spray Deposited CZTS Thin Films”. International Journal of Research in Informative Science Application & Techniques (IJRISAT), vol. 4, no. 5, May 2020, pp. 16-25, doi:10.46828/ijrisat.v4i5.92.