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비파괴 분석법을 적용한 결정질 태양전지 모듈의 Snail trail 현상 연구
김다정(Dajung Kim),김남수(Namsu Kim),황경준(Kyung-Jun Hwang),이주호(Ju Ho Lee),정신영(Sinyoung Jeong),정대홍(Dae Hong Jeong) 한국태양광발전학회 2014 Current Photovoltaic Research Vol.2 No.2
In recent years, discoloration defects, called as snail trail, have been observed at many crystalline photovoltaic modules after a period of time ranging from several months to several years after initial installation. It has been reported that this phenomenon doesn"t impact on the performance of photovoltaic modules, but it can be detected through simple visual inspection. The origin and detailed mechanism for the formation have not been identified. In this study, non-destructive analysis by Raman spectroscopy has been carried out to investigate the origin of this phenomenon. In parallel, destructive analysis by scanning electron microscopt and transmission electron microscopy was also performed in order to confirm the results from non-destructive method. Through the extensive analysis, it was found that the main cause for discoloration is the formations of Ag₂CO₃ and AgC₂H₃O₂. Detailed mechanism for the formation of these particles was indentified through systematic studies.