Abstract As an alternative to conventional encapsulation concepts for a double glass photovoltaic (PV) module, we introduce an innovative ionomer-based multi-layer encapsulant, by which the application of additional edge sealing to prevent moisture penetration is not required. The spontaneous moisture absorption and desorption of this encapsulant and its raw materials, poly (ethylene-co-acrylic acid) and an ionomer, are analyzed under different climatic conditions in this work. The relative air humidity is thermodynamically the driving force for these inverse processes and determines the corresponding equilibrium moisture content (EMC). Higher air humidity results in a larger EMC. The homogenization of the absorbed water molecules is a diffusion-controlled process, in which temperature plays a dominant role. Nevertheless, the diffusion coefficient at a higher temperature is still relatively low. Hence, under normal climatic conditions for the application of PV modules, we believe that the investigated ionomer-based encapsulant can “breathe” the humidity: During the day, when there is higher relative humidity, it “inhales” (absorbs) moisture and restrains it within the outer edge of the module; then at night, when there is a lower relative humidity, it “exhales” (desorbs) the moisture. In this way, the encapsulant protects the cell from moisture ingress.

中文翻译：

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基于离聚物的密封剂中的吸湿和解吸：一种用于 CIGS 薄膜光伏组件的自呼吸密封剂

摘要 作为双层玻璃光伏 (PV) 模块传统封装概念的替代方案，我们引入了一种创新的基于离聚物的多层封装剂，通过该封装剂，不需要应用额外的边缘密封来防止水分渗透。在这项工作中，分析了这种密封剂及其原材料聚（乙烯-共聚-丙烯酸）和离聚物在不同气候条件下的自发吸湿和解吸。相对空气湿度是这些逆过程的热力学驱动力，并决定了相应的平衡水分含量 (EMC)。较高的空气湿度会导致较大的 EMC。吸收的水分子的均质化是一个受扩散控制的过程，其中温度起主导作用。尽管如此，较高温度下的扩散系数仍然较低。因此，在光伏组件应用的正常气候条件下，我们认为所研究的基于离聚物的封装材料可以“呼吸”湿度：在白天，当相对湿度较高时，它“吸入”（吸收）水分并抑制它在模块的外边缘内；然后在晚上，当相对湿度较低时，它会“呼出”（解吸）水分。以这种方式，密封剂保护电池免受湿气侵入。它“吸入”（吸收）水分并将其限制在模块的外缘内；然后在晚上，当相对湿度较低时，它会“呼出”（解吸）水分。以这种方式，密封剂保护电池免受湿气侵入。它“吸入”（吸收）水分并将其限制在模块的外缘内；然后在晚上，当相对湿度较低时，它会“呼出”（解吸）水分。以这种方式，密封剂保护电池免受湿气侵入。