A numerical simulation of the behavior of three types of solar cells: Si (N⁺)/Si (P), SnO2/Si (N⁺)/Si (P), and ZnO/Si (N⁺)/Si (P) is presented in this study. The simulation is devoted to analyzing the impact of the SnO2 and ZnO window layers on the device’s performance. We utilize a renowned photovoltaic modelling code, namely PC1D. A comparative analysis was conducted on the performance of the three structures Si (N⁺)/Si (P), SnO2 /Si (N⁺)/Si (P), and ZnO /Si (N⁺)/Si (P), assessing their impact on the characteristic I (V)/P(V) and efficiency, confirming an increase in conversion efficiency with the addition of the two anti-reflective layers such as SnO2 and ZnO with 31.41% and 33.64%, respectively.