Current Photovoltaic Research

Korea Photovoltaic Society (한국태양광발전학회)
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Non-destructive Analysis of Snail Trail on Silver Grid Line in PV Module

비파괴 분석법을 적용한 결정질 태양전지 모듈의 Snail trail 현상 연구

  • Kim, Dajung (Components & Materials Physics Research Center, KETI) ;
  • Kim, Namsu (Components & Materials Physics Research Center, KETI) ;
  • Hwang, Kyung-Jun (Components & Materials Physics Research Center, KETI) ;
  • Lee, Ju Ho (Reliability Technology Research Center, KETI) ;
  • Jeong, Sinyoung (Department of Chemistry Education, Seoul National University) ;
  • Jeong, Dae Hong (Department of Chemistry Education, Seoul National University)
  • 김다정 (부품소재물리연구센터, 전자부품연구원) ;
  • 김남수 (부품소재물리연구센터, 전자부품연구원) ;
  • 황경준 (부품소재물리연구센터, 전자부품연구원) ;
  • 이주호 (신뢰성평가연구센터, 전자부품연구원) ;
  • 정신영 (화학교육학과, 서울대학교) ;
  • 정대홍 (화학교육학과, 서울대학교)
  • Received : 2014.05.30
  • Accepted : 2014.06.17
  • Published : 2014.06.30
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Abstract

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 $Ag_2CO_3$ and $AgC_2H_3O_2$. Detailed mechanism for the formation of these particles was indentified through systematic studies.

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