Table 1
Flash testing results under standard test condition (STC) of the front side of bifacial PERC modules for screening test of PID based on IEC 62804-1 (foil method). Only results on module faces that were stressed exhibiting degradation are shown. Isc is the short circuit current, Voc, open circuit voltage; FF, fill factor; and Pmax, the maximum power point.
| Test step | Isc (A) | Voc (V) | FF (%) | Pmax (W) | % Pmax change from initial | Isc (A) | Voc (V) | FF (%) | Pmax (W) | % Pmax change from initial |
|---|---|---|---|---|---|---|---|---|---|---|
| Stress level (25 °C 168 h, Al foil) | –1500 V (rear side stress) | +1500 V (front side stress) | ||||||||
| Initial | 10.74 | 48.87 | 79.9 | 419.3 | 0 | 10.69 | 48.59 | 79.9 | 415.0 | 0 |
| PID stress test | 10.50 | 47.82 | 79.4 | 398.8 | –4.9 | 10.57 | 47.96 | 79.3 | 402.1 | –3.1 |
| Intermediate recovery (storage) | 10.11 | 46.78 | 78.8 | 372.6 | –11.1 | |||||
| Final recovery 19 kWh/m2 illum. | 10.71 | 48.83 | 79.8 | 417.1 | –0.5 | 10.69 | 48.59 | 79.9 | 415.0 | 0 |
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