Optimization Strategies for Metallization in N-Type Crystalline Silicon Topcon Solar Cells: Pathways to Elevated Fill Factor and Enhanced Efficiency

In the advancement of photovoltaic technology, the optimization of the metallization process is crucial for balancing electrical conductivity and optical performance in solar cell fabrication. This process is vital as it directly impacts the efficiency and quality of solar cells, traditionally measured by the fill factor (FF). Historically, efforts have been concentrated on evolving metal contacts to reduce optical shading and series resistance, which degrade solar cell efficiency. Our study focuses on enhancing n-type Tunnel Oxide Passivated Contact (n-TOPCon) solar cells through the optimization of screen-printing metallization, particularly examining the effects of squeegee speeds and snap-off distances. Employing a mix of experimental and analytical methodologies, we aimed to identify optimal conditions that improve electrical and optical performance, thereby elevating cell efficiency. Our findings indicate that a squeegee speed of 170 mm/sec, coupled with a 1.4 mm snap-off distance, substantially boosts solar cell performance, evidenced by a current density (Jsc) of 38.96 mA/cm², open-circuit voltage (Voc) of 684.29 mV, fill factor (FF) of 78.77%, and a power conversion efficiency (PCE) of 21.00%. Further, dark I-V measurements confirmed a shunt resistance (Rsh) of 6.25 x 106 Ω and a reduced series resistance (Rs) of 6.48 Ω, underscoring the significance of precise metallization in reducing resistive losses and enhancing efficiency. Future research will transcend squeegee speed and snap-off distance adjustments to include the exploration of innovative materials and cutting-edge printing techniques. The potential incorporation of nanomaterials and conducting polymers aims to further refine the metallization process, promising to push the boundaries of efficiency and cost-effectiveness. This progression is essential for advancing n-TOPCon solar cell development and setting new industry standards, propelling the sustainable energy movement.