p型PERC双面太阳电池背面铝栅线的设计  

Design of Rear Aluminum Gridline for p-Type Bifacial PERC Solar Cells

作　　者：吴翔 陈璐 魏凯峰 

机构地区：[1]国家电投集团西安太阳能电力有限公司,西安710000

出　　处：《微纳电子技术》2017年第12期808-812,共5页Micronanoelectronic Technology

摘　　要：钝化发射极背面接触(PERC)双面太阳电池(PERC+)背面采用丝网印刷铝栅线的设计,代替常规PERC电池背面全铝背场层,达到背面发电的效果。对不同背面铝栅线宽度的PERC+电池和常规PERC电池的电性能及激光开窗截面图进行比较,发现了不同宽度的铝栅线对电池背面空洞率和局部背表面场(LBSF)层的质量有较大影响,合适的铝栅线宽度能最大程度地保证PERC+电池的转换效率。实验得出在相同的激光开窗工艺下,当背面铝栅线设计宽度为250μm时,PERC+电池具有较好的铝栅线高宽比,烧结后的激光开窗区域形成了良好的LBSF层。同时,所有电池在测试时背景采用不反光黑布。测试结果显示,最优组的PERC+电池平均正面转换效率达到21.21%、平均背面转换效率达到13.97%。The biracial passivated emitter rear contact （PERC） solar cell （PERC ＋ ） applies a screen-printed rear A1 gridline instead of the rear full-area aluminum （A1） rear layer of conven- tional PERC cell to achieve the rear power generation. The electrical performances and the laser window cross section views of the PERC ＋ cells with different rear A1 gridline widths and con- ventional PERC cells were compared. The results indicate that the A1 gridlines with different widths have greater effect on the rear void rates of cell and the quality of local back surface field （LBSF） layer. The proper width of the A1 gridline can ensure the transfer efficiency of the PERC ＋ cells furthest. The experiment shows that when the design width of the A1 finger grid is 250 /~m under the same laser window process, the PERC ＋ cells have better height-width ratio of the A1 gridline and a good LBSF layer in the laser window area after firing process. Meanwhile, a non-reflecting black cloth was used in the test background when all cells were measured. The test results show that the average front transfer efficiency and average rear transfer efficiency of the optimal group for the PERC＋ cells reach 21.21% and 13.97%, respectively.

关 键 词：钝化发射极背面接触(PERC)电池 双面太阳电池 背面金属化 铝栅线 空洞 局部背表面场(LBSF) 

分 类 号：TM914.4[电气工程—电力电子与电力传动]