R. T. Subramaniam, N. M. Saidi, F. S. Omar, and R. Kasi, “Effect of Nickel Oxide on the Conductivity of Polymer Blend Electrolyte Doped with Sodium Iodide and Its Application in Dye-Sensitized Solar Cell”, Malaysian J. Sci., vol. 38, no. 1, pp. 1–12, Apr. 2019.