Optimization of Rear Local Al-Contacts on High Efficiency Commercial PERC Solar Cells with Dot and Line Openings

Table 1

Line and dot opening spaces of each area on SC wafers.

Number	Line opening space (mm)	Dot opening space (mm)
1	Full Al-BSF	Full Al-BSF
2	0.25	0.14
3	0.33	0.16
4	0.5	0.2
5	1.0	0.28
6	1.43	0.33
7	2.0	0.4
8	3.33	0.51
9	No etching	No etching