Advanced Industrial Tunnel Oxide Passivated Contact Solar Cell by the Rear-Side Local Carrier-Selective Contact

In this study, we propose an advanced tunnel oxide passivated contact (TOPCon) solar cell structure for bifacial usage. The proposed structure, named advanced industrial TOPCon (Ai-TOPCon), adopts rear-side local carrier-selective contacts to avoid rear-side light-absorption loss. Ai-TOPCon features larger rear-side light currents and improves the power density by approximately 0.28 mW/cm
²
for bifacial usage in a 20% albedo scenario. Several types of Ai-TOPCon and industrial TOPCon (i-TOPCon) are evaluated, and the optimization of the structure resulted in a power density of 28.73 mW/cm
²
. Loss analysis revealed that the reduced Auger recombination volume was the main factor contributing to the improvement of cell performance, and the light-absorption problem was solved by reducing the rear-side heavy-doped region.