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태양광 리본용 Sn-Pb-Ag 솔더의 특성에 미치는 Ag의 영향
손연수,조태식,Son, Yeon-Su,Cho, Tae-Sik 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.5
We have studied the effects of Ag on the characteristics of $Sn_{60}Pb_{40}Ag_x$ (wt%) solder for photovoltaic ribbon. Ag atoms in the solder formed an alloy phase of $Ag_3Sn$ after reacting with some part of Sn atoms, while they did not react with Pb atoms, but decreased the mean size of Pb solid phase. The enhancement of peel strength between solar cell and ribbon is an important part in the developments of long-lifespan solar module. The peel strength of the solder ribbon of $Sn_{60}Pb_{40}$ (wt%) was $169N/mm^2$, and it was largely enhanced by adding a small amount of Ag atoms. The maximum peel strength was $295N/mm^2$ in the solder ribbon of $Sn_{60}Pb_{40}Ag_2$ (wt%). This result is caused by the high binding energy of 162.9 kJ/mol between Ag atoms in the solder and Ag atoms in Ag sheet.