| doping level Nb (cm−3) | Short-circuit current density (mA∙cm−2) under moderate concentration (C = 50 Suns) | Short-circuit current density (mA∙cm−2) under normal illumination (C = 1 Sun) |
| 1013 | 1262.82 | 23.88 |
| 5 × 1013 | 1071.83 | 19.99 |
| 1014 | 985.89 | 18.24 |
| 5 × 1014 | 778.86 | 14.04 |
| 1015 | 686.83 | 12.20 |
| 5 × 1015 | 470.49 | 7.99 |
| 1016 | 379.36 | 6.32 |
| Variation rate (%) | 69.96 | 73.53 |