D. Agustini, H. Hardeli, B. Oktavia, and P. Permatasari, “Optimization of Tannic Acid Polymerization to Improve the Efficiency of Dye-Sensitized Solar Cells: Effect of Temperature and Monomer Concentration”, J.Ris.Kim., vol. 16, no. 2, pp. 69–83, Sep. 2025.