Babatunde, Rasaq Ayinla, and R. Kola Odunaike. 2026. “Effect of Copper Concentration on Optical Band Gap of Spin Coated Cu2ZnSnS4 Thin Films for Photovoltaic Application”. Nigerian Journal of Physics 35 (2): 216-21. https://doi.org/10.62292/njp.v35i2.2026.581.