Often photovoltaic modules are constructed with materials that are sensitive to water. This is most often the case with thin film technologies, including perovskite cells, where the active layers are a few microns thick and can be sensitive to moisture, liquid water or both. When moisture or liquid water can ingress, a small amount of water can lead to corrosion and depending on the resulting reactions, a larger local detrimental effect is possible. To prevent moisture from contacting photovoltaic components, impermeable frontsheets and backsheets are used with a polyisobutylene (PIB)‐based edge seal material around the perimeter. Here, we evaluate the ability of a PIB‐based edge seal using a molecular sieve desiccant to keep moisture out for the expected module lifetime. Moisture ingress is evaluated using test coupons where the edge seal is placed between 2 pieces of glass, one of which has a metallic calcium film on it, and monitoring the moisture ingress distance as a function of time. We expose samples to different temperature and humidity conditions to create permeation models useful for extrapolation to field use. This extrapolation indicates that this PIB material is capable of keeping moisture out of a module for the desired lifetime.

中文翻译：

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带有分子筛干燥剂的聚异丁烯边缘封口的水分进入预测

通常，光伏模块由对水敏感的材料构成。薄膜技术（包括钙钛矿电池）最经常出现这种情况，其中活性层的厚度为几微米，并且可能对水分，液态水或两者均敏感。当潮气或液态水进入时，少量的水会导致腐蚀，并且取决于所产生的反应，可能会产生更大的局部有害作用。为防止水分接触光伏组件，不可渗透的前面板和后面板与周边的聚异丁烯（PIB）基边缘密封材料一起使用。在这里，我们评估了使用分子筛干燥剂的基于PIB的边缘密封在预期模块使用寿命内保持水分的能力。使用测试试样评估水分进入，其中将边缘密封件放置在两块玻璃之间，其中一块玻璃上面有金属钙膜，并监测水分进入距离随时间的变化。我们将样品暴露在不同的温度和湿度条件下，以创建可用于外推到现场使用的渗透模型。该推断表明该PIB材料能够在所需的使用寿命内将水分保持在模块之外。