Table 2 Electrical characteristics of fabricated solar cells with/without using silica-sol on rear side during phosphorus diffusion
Solar cell parameters | Group 1 | Group 2 applied spin speed (resulted film thickness) | |||
|---|---|---|---|---|---|
Without silica-sol | 2,000 rpm (0.77 μm) | 4,000 rpm (0.43 μm) | 6,000 rpm (0.30 μm) | 8,000 rpm (0.24 μm) | |
J sc (mA/cm 2 ) | 22.2 | 22.1 | 20.7 | 21.7 | 22.2 |
V oc (mV) | 515 | 521 | 522 | 522 | 525 |
FF (%) | 54 | 64 | 68 | 68 | 70 |
Eff (%) | 6.19 | 7.37 | 7.32 | 7.62 | 8.12 |