An optical comparison of silicone and EVA encapsulants under various spectra
An optical comparison of silicone and EVA encapsulants under various spectra
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不同光谱下有机硅和 EVA 封装材料的光学比较
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
B. Ketola
中科院分区：
文献类型：
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作者：
K. McIntosh;J. Cotsell;A. Norris;Nick E. Powell;B. Ketola
在AM1-5g频谱下，使用硅胶封装剂而不是EVA， c-Si模块的效率可以提高0.5-1.5%（相对）。这种增加主要是由于波长小于~ 400 nm的光子被硅树脂传输，但被EVA阻挡。对于具有良好“蓝色响应”的电池和具有较高折射率的有机硅，效率的提高最高。在这项工作中，我们表明，当计算AM1-5g频谱时，硅树脂相对于EVA的光学优势往往被低估了在该领域的预期。这是因为入射光谱通常比AM1-5g频谱“更蓝”，特别是在夏季和阴天。在这种情况下，大部分光子的波长小于400nm。通过光线追踪，我们发现，在亚利桑那州凤凰城阳光明媚的夏日，硅胶相对EVA的相对优势增加了0.3%，在德克萨斯州布朗斯维尔阴天的夏日，硅胶的相对优势增加了0.7%。对于海洋气候和高反照率的装置，预计硅胶的相对优势还会增加0.7%。
Under the AM1–5g spectrum, the efficiency of a c-Si module can be increased by 0.5–1.5% (relative) by using a silicone encapsulant rather than EVA. This increase is primarily due to photons of wavelengths less than ∼400 nm being transmitted by silicone but blocked by EVA. The highest increase in efficiency arises for cells with a good ‘blue response’ and for silicones of a higher refractive index. In this work we show that when calculated for the AM1–5g spectrum, the optical advantage of silicone over EVA tends to be an underestimate of what can be expected in the field. This is because incident spectra are frequently ‘bluer’ than the AM1–5g spectrum, particularly in summer and on cloudy days. In such cases, a larger fraction of photons have a wavelength less than 400 nm. With ray tracing, we find that the relative advantage of silicone over EVA is increased by an additional 0.3% on a sunny summer day in Phoenix AZ, and by 0.7% on a cloudy summer day in Brownsville TX. Still greater increases are expected for maritime climates and for installations with high albedo.