印刷烧结工艺对单晶硅太阳电池栅线形貌及电学性能的影响

Influence of Screen Printing and Sintering Process on Grid Morphologies and Electrical Properties of Single-Crystalline Silicon Solar Cells

正面金属化是制备单晶硅太阳电池中的重要工艺步骤,栅线质量对电池的电学性能起着关键的作用。通过探究不同栅线处理工艺对栅线宽度的影响,发现烧结过程中栅线会向两侧崩塌,从而增加电极的遮光率,结合表征手段对这一过程进行了分析和机理阐释。在对浆料类型、网版开口宽度、网版图案以及烧结峰值温度的研究中,发现浆料中的有机物含量会影响栅线在烧结过程中的稳定性,而合适的网版开口及图案设计能降低遮光面积和栅线高度起伏,从而显著提升电池的电学性能,制得了最高转换效率为22.54%的单晶硅PERC电池。可以预见,通过优选浆料和网版,可以进一步改善单晶PERC电池的电学性能,获得更高的光电转换效率。

Front metallization is one of the most important steps during the process of fabricating single-crystalline silicon(sc-Si)solar cells.The quality is proven to be closely relative to electrical properties of solar cells.According to the investigation of the influence of grid treatment techniques on the width of grids,it is found the gird will collapse to both sides in the sintering process,which might increase the shading coefficient of electrodes.With the help of characterization,the mechanism of this phenomenon was analyzed.What\s more,the effects of the slurry types,halftone opening widths,halftone patterns and the peak temperature of sintering on electrical properties were investigated.The organic content of slurry is found to affect the stability of grids in the sintering process,and the suitable opening width or design of halftone patterns can efficiently reduce the shading areas and keep the grid height consistently.On this basis,sc-Si PERC solar cells with a high average conversion efficiency of 22.54% were fabricated.It could be expected that through optimization of slurry and halftone pattern,improved electrical properties and higher efficiencies of sc-Si PERC solar cells will be realized.