Hardeli, H.; Ade Putri, A.; Gusmar Lina, R.; Feronika, W.; Permatasari, P. Enhancing DSSC Performance through Metal-Doped TiO₂ and Poly-Tannin Dye: A Study on Bandgap Reduction and Photon Absorption. J-TETA 2025, 4, 19-29.