Presentation Details
Accelerated Corrosion Testing of TOPCon Solar Cells in Pressure Cooker Test (PCT) Chamber

AKASH LOHAR, ADRIJA DEY, SHASHWATA CHATTOPADHYAY.

RAYZON SOLAR LIMITED, SURAT, India

Abstract


Corrosion susceptibility of the TOPCon solar cells is a matter of concern for the solar panel manufacturers as it can affect the long term reliability of the solar panels. We have studied the corrosion resistance of TOPCon solar cells of different design (M10R and G12R, laminated with EPE encapsulant from different manufacturers) in PCT chamber, at 121 °C and 100% RH for 2 cycles of 24 hours each.  The samples were prepared using transparent backsheet on both front & backside, which allowed acceleration of the corrosion reactions through moisture ingress from both sides. The power degradation increased non-linearly with the exposure time in PCT test. Solar cells of M10R design have degraded more than 2 times of the G12R design which indicates that the cell manufacturer has improved the G12R metallization. Also, EPE-B samples have degraded 7x higher than the EPE-A samples, indicating the major role of the encapsulant composition in the corrosion of the solar cells. The power degradation has been correlated with the EL intensity variation (exponential relation to the FWHM of the EL intensity histogram has been observed), which can enable the direct estimation of the power loss from the EL images of the laminates. This indicates the possibility of quick screening of the samples without the need to power measurements.

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