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  4. Non-destructive degradation analysis of encapsulants in PV modules by Raman spectroscopy
 
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2011
Journal Article
Title

Non-destructive degradation analysis of encapsulants in PV modules by Raman spectroscopy

Abstract
Raman Probe Spectroscopy as a powerful tool for analyzing the degradation behavior of encapsulants in c-Si based PV modules is reported. A non-destructive and quick testing method is needed in order to follow material changes during the aging of PV modules. Two types of c-Si PV modules with ethylene vinyl acetate (EVA) encapsulation have been aged indoors under damp-heat conditions (85% r.h./85 °C) and under combined UV/moisture conditions, respectively. The aged modules as well as a non-aged reference module for each type were analyzed by Raman Spectroscopy. The degradation of the encapsulant was observed, resulting in an increasing fluorescence background, as well as changing intensities of EVA Raman peaks. A lateral non-uniformity of the fluorescence intensity of and the EVA CH stretching vibration intensity ratios, depending on the position above the cell as well as from the aging condition, could be observed and it might be an indicator for the diffusion of water i n the encapsulant.
Author(s)
Peike, Cornelia
Kaltenbach, Thomas
Weiß, Karl-Anders  
Köhl, Michael
Journal
Solar energy materials and solar cells  
DOI
10.1016/j.solmat.2011.01.030
Language
English
Fraunhofer-Institut für Solare Energiesysteme ISE  
Keyword(s)
  • Photovoltaische Module

  • Systeme und Zuverlässigkeit

  • Silicium-Photovoltaik

  • Photovoltaische Module und Kraftwerke

  • Modulintegration

  • Modulentwicklung

  • Modultechnologie und -analyse

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