Johari, Nur Aliesa, et al. “Analysis of Inverted Planar Perovskite Solar Cells With Graphene Oxide As HTL Using L9 OA Taguchi Method”. Semarak International Journal of Material Research, vol. 3, no. 1, June 2025, pp. 43-56, doi:10.37934/sijmr.3.1.4356.