研究目的
To investigate the influence of the ethylene-vinyl acetate (EVA) film quality on potential induced degradation in p-type monocrystalline silicon solar cells under high voltage bias and damp heat conditions.
研究成果
The quality of the EVA film significantly influences the degradation mechanisms in PV modules under high voltage bias and damp heat conditions. Modules with 'aged' EVA films degrade rapidly due to silver line corrosion caused by residual peroxides. Ensuring the use of 'fresh' EVA films can mitigate such degradation.
研究不足
The study is limited to p-type monocrystalline silicon solar cells and specific accelerated test conditions. The findings may not directly translate to other cell types or real-world operating conditions.
1：Experimental Design and Method Selection:
The study involved assembling mini PV modules with EVA films of different ages and exposing them to accelerated test conditions (85% relative humidity, 60°C, +1000 V bias) to study degradation mechanisms.
2：Sample Selection and Data Sources:
In-house developed mini modules with p-type monocrystalline silicon solar cells were used. The EVA films were categorized based on their age since removal from sealed packaging.
3：List of Experimental Equipment and Materials:
PV modules with dimensions of 23 × 33 cm2, EVA films of different ages, climate chamber for accelerated testing, electroluminescence imaging technique, sun simulator for electrical characterization.
4：Experimental Procedures and Operational Workflow:
Modules were exposed to damp heat and high voltage bias, periodically characterized for performance and degradation through electrical measurements and EL imaging.
5：Data Analysis Methods:
Performance parameters (Voc, Isc, FF) were monitored, and degradation rates were calculated. DSC was used to measure the degree of crosslinking of EVA films.
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