Yusuf, A. S., A. M. Ramalan, A. A. Abubakar, and I. K. Mohammed. “Progress on Electron Transport Layers for Perovskite Solar Cells”. Nigerian Journal of Physics, vol. 32, no. 4, Feb. 2024, pp. 81-90, doi:10.62292/njp.v32i4.2023.156.