Bamaiyi, E. A.; Edomoh, P. E.; Uno, U. E. Determination of the Optical Band Gap of TiO2 and Perovskite Absorber Layers in an Organic-Inorganic Hybrid Lead-Halide Perovskite Solar Cell Using UV-Visible Spectroscopy. NJP 2026, 35 (S), 67-74. https://doi.org/10.62292/njp.v35(s).2026.712.