Glass Evaluation

Glass resistivity is key to PID susceptibility and must be tested independently from the solar cell and EVA

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Since the PV community recognized the PID issue, extensive research has shown that both the solar cell and its SiNx layer, as well as the encapsulation materials, significantly impact a module's PID susceptibility. In addition to the polymer foil, the glass also plays a critical role and needs to be evaluated.

The PIDcon  system allows for the assessment of glass influence on PID susceptibility. Using a sample stack that simulates a module, the user simply places the solar cell, EVA foil, and the glass to be tested. For accurate comparison, solar cells from the same batch and the same EVA foil should be used. Table 1 presents the ion analysis of various glass types tested via ICP.

Table 1: Ion analysis of the investigated glass types by ICP

Table 1: Ion analysis of the investigated glass types by ICP

Fig. 1: PIDcon measurement with the same type of solar cell and EVA foil and different glass types

Fig. 1: PIDcon measurement with the same type of solar cell and EVA foil and different glass types

Fig. 2: dependency of the decrease in parallel resistance on the glas type [1]

Fig. 2: dependency of the decrease in parallel resistance on the glas type [1]

For more information please read:
[1] V. Naumann, Ursachenanalyse und physikalische Modellbildung für potenzial-induzierte Degradation von Silizium-Solarzellen, Dissertation, Martin-Luther-Universität Halle-Wittenberg (2014)

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