The global transition toward sustainable energy demands low-cost, eco-friendly photovoltaic technologies accessibleto developing economies. This work addresses this challenge by preparing and characterizing Sb-doped ZnOthinfilms via sol-gel spin coating, evaluated as photoanodes in Dye-Sensitized Solar Cells (DSSCs) sensitisedwithpurple sweet potato (Ipomoea batatas) anthocyanin, directly supporting SDG 7 (Affordable and Clean Energy). Films containing 2.0 to 4.0 wt% Sb were deposited on FTO substrates and annealed between 400 and 600°C. XRDconfirmed a hexagonal wurtzite crystal structure with grain dimensions growing from 17.76 nm at 400°Cto 28.39nm at 600°C. SEM revealed well-formed hexagonal nanoparticle surfaces, and EDS validated successful Sbintegration. UV-Vis analysis showed a thermally adjustable bandgap spanning 3.35 to 3.41 eV, with peak optical properties at 550°C. Photovoltaic testing demonstrated that 3.5 wt% Sb achieved the highest power conversionefficiency of 0.453% (Voc = 0.64 V, Jsc = 1.20 mA/cm², FF = 59.0%), representing a 43% improvement over the2.0 wt% Sb reference (0.316%). These findings establish clear composition-structure-performance relationships for Sb-doped ZnO photoanodes with natural sensitizers, providing a foundational framework for future advances insustainable, low-cost solar cell development for energy-scarce communities