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Nondestructive characterization of voids in rear local contacts of perc type solar cells

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I3E Technologies
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NONDESTRUCTIVE CHARACTERIZATION OF VOIDS IN REAR LOCAL CONTACTS OF PERC-TYPE SOLAR CELLS ABSTRACT In this paper, we present two nondestructive characterization methods for the detection of voids in rear local contacts of passivated emitter and rear-type solar cells, namely scanning acoustic microscopy and computer tomography.We compare both methods and include a comparison with electroluminescence measurements. It is shown in this paper that voids can easily be detected with both measurement types without any sample preparation.We found a good match of scanning acoustic microscopy (SAM) and computer tomography (CT), which is presented for this purpose for the first time. The investigation was carried out for different aluminum pastes.

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