“Graphene Oxide and Reduced Graphene Oxide As Hole Transport Layers for Improved Efficiency in Fullerene-Based Bulk Heterojunction Organic Solar Cells: A Numerical Simulation Study ”. 2025. East European Journal of Physics, no. 1 (March): 217-32. https://doi.org/10.26565/2312-4334-2025-1-23.