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Energies 2017, 10(4), 529; doi:10.3390/en10040529

Comparison of the 60Sn40Pb and 62Sn2Ag36Pb Solders for a PV Ribbon Joint in Photovoltaic Modules Using the Thermal Shock Test

1
School of Mechanical Engineering, Chung-Ang University, Seoul 156-756, Korea
2
Department of Automotive, Yeoju Institute of Technology, Gyeonggi-do 12652, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Senthilarasu Sundaram
Received: 15 January 2017 / Revised: 10 April 2017 / Accepted: 10 April 2017 / Published: 13 April 2017
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Abstract

In this study, the characteristics of a photovoltaic (PV) ribbon (t = 0.25 mm) joint with 60Sn40Pb and 62Sn2Ag36Pb solders were evaluated using thermal shock tests. The thermal shock tests were performed under three conditions: −40–65 °C, −40–85 °C, and −40–105 °C. The results of these tests were analyzed using electroluminescence (EL) and cross-sectional images. Following testing, broken metal fingers (MFs) were confirmed near the solder joint. PV module degradation was attributed to the broken finger ratio (BFR) based on quantitative analysis of the dark rectangular (DR) regions on the EL images. In addition, the activation energy of the broken MFs was calculated from the increasing BFR. Thermal characteristic variations due to the added Ag in the PV ribbon solder joints were evaluated through observation of solder micro-structure changes following thermal shock tests. View Full-Text
Keywords: electroluminescence (EL); dark rectangular (DR); broken finger ratio (BFR); 60Sn40Pb (SP); 60Sn2Ag38Pb (SAP) electroluminescence (EL); dark rectangular (DR); broken finger ratio (BFR); 60Sn40Pb (SP); 60Sn2Ag38Pb (SAP)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Kang, M.-S.; Jeon, Y.-J.; Kim, D.-S.; Shin, Y.-E. Comparison of the 60Sn40Pb and 62Sn2Ag36Pb Solders for a PV Ribbon Joint in Photovoltaic Modules Using the Thermal Shock Test. Energies 2017, 10, 529.

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