Mohd Alias, N. S. N., F. Arith, A. N. Mustafa, M. M. Ismail, N. F. Azmi, and M. S. Saidon. “Impact of Al on ZnO Electron Transport Layer in Perovskite Solar Cells”. Journal of Engineering and Technological Sciences, vol. 54, no. 4, July 2022, p. 220409, doi:10.5614/j.eng.technol.sci.2022.54.4.9.