NEW METHOD FOR PATTERNING FRONT AND REAR CONTACTS OF HIGH-EFFICIENCY SOLAR CELLS WITH MECHANICAL SCRIBER

摘要

Passivated Emitter and Rear Cell (PERC) fabricated by using low cost mechanical scribing process for patterning the rear passivation layers has shown considerable potential to achieve high efficiency over 20% and significant cost reduction. For the Mechanically Scribed (MS)-PERC with random pyramid at the front surface of the cell and with the contact patterned by the mechanical scriber, an efficiency of 19.42% was achieved on a 0.5 Ωcm, p-type FZ-Si wafer. The passivating layers of the cells were thermally grown oxide. Random pyramids at the surface were formed by sodium carbonate (Na_2CO_3) solutions. For the purpose of achieving high efficiency without any photolithography process, the front surface of the cell with random pyramid was scribed for patterning the metal contact.