Study on the bowing of monocrystalline silicon MWT plus PERC solar cells with different laser-ablation condition

The thinner silicon wafers result in the more serious cells bowing, which increases the fragmentation rate and decrease the conversion efficiency. Based on the laser-ablation process on Metal Wrap Through + Passivated Emitter and Rear Contact (MWT+PERC) solar cells, we studied the effect of the aluminum-silicon (Al-Si) contact area on the bowing by theoretical calculation and Abaqus finite element analysis (FEA). Meanwhile, we proposed a novel rear Al-Si contact pattern of silicon cells to improve the bowing after treatments. The results indicated that the bowing can be improved by adopting the rear surface dotted pattern based on fixed laser-ablation area.