研究目的
Investigating the degradation mechanisms of polymeric encapsulants used in photovoltaic modules exposed to different climates.
研究成果
The study concludes that the degradation behavior of EVA encapsulant materials varies significantly with climate conditions and within different areas of the PV module. Hot-humid climates lead to higher moisture and acetic acid concentration, while hot-dry climates result in more conjugated alkene formation. The findings emphasize the need for climate-specific encapsulant materials and designs to enhance PV module longevity.
研究不足
The study is limited to EVA encapsulant materials from two specific types of PV modules exposed to two climates. The findings may not be universally applicable to all encapsulant materials or climates. The study also highlights the complexity of degradation mechanisms influenced by varying micro-environmental conditions within modules.
1：Experimental Design and Method Selection:
The study involved analyzing EVA encapsulant materials from PV modules exposed to hot-humid and hot-dry climates for 18 years. Methods included UV/Vis/NIR spectroscopy, FTIR spectroscopy, Raman spectroscopy, thermal analysis (TGA and DSC), and X-ray diffraction.
2：Sample Selection and Data Sources:
Samples were extracted from two types of monocrystalline silicon photovoltaic modules produced by Siemens Solar in 1992, exposed in Shenzhen (hot-humid) and Dunhuang (hot-dry).
3：List of Experimental Equipment and Materials:
Lambda 950 spectrometer, Spectrum GX FTIR spectrometer, LabRAM HR800 confocal spectrometer, Perkin Elmer DSC 4000, Rigaku Smartlab powder diffractometer.
4：Experimental Procedures and Operational Workflow:
Modules were cut into pieces, and EVA layers were analyzed for optical, chemical, and morphological properties.
5：Data Analysis Methods:
Absorbance ratios for FTIR peaks, fluorescence background in Raman spectra, thermal degradation stages in TGA, crystallinity from DSC and X-ray diffraction.
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