Computer simulation of planar bifacial TOPCon solar cells by using Quokka 3 software

This study presents a comprehensive simulation-based analysis of bifacial Tunnel Oxide Passivated Contact (TOPCon) solar cells using the Quokka 3 software. It investigates the impact of different antireflection coatings and rear albedo variations on device performance. One of the main findings is the significant improvement in optical and electrical properties after applying MgF2 antireflection coating on top of the cell. Structures with the addition of MgF2 achieved low, uniform reflectance and increased light absorption across the full solar spectrum. Compared to structures without MgF2, those with the coating exhibited superior external quantum efficiency (EQE) and reduced reflected photocurrent density (JR) with the value of 3.38 mA/cm2. Additionally, simulations revealed that increasing rear albedo values improved short-circuit current density (Jsc) and power conversion efficiency (PCE). The highest PCE of 27.37% and Jsc of 45.07 mA/cm2 was obtained from a structure combining MgF2 and a rear albedo of 0.3 Voc in this case was equal to 0.74V. These results confirm that optimizing both antireflection coatings and rear-side illumination can significantly improve the efficiency of bifacial TOPCon solar cells, offering a viable pathway for enhanced photovoltaic (PV) performance.