Abstract Ethylene vinyl acetate (EVA) has for decades been the material of choice for photovoltaic (PV) module encapsulation. However, while it is relatively inexpensive and initially adheres well to module components, EVA discolors with age and—as interfacial adhesion degrades—becomes susceptible to delamination, ultimately resulting in reduced module efficiency and shortened service lifetimes. As potential replacements for EVA, ionomer thermoplastic materials cure faster, are more resistant to discoloration and potential induced degradation, and do not evolve corrosive acetic acid, making them compatible with new device materials such as perovskites. Since there is limited information on ionomer durability for PV module applications, a series of field and accelerated laboratory aging studies were conducted to assess ionomer interface stability in the presence of terrestrial environmental stressors. It is shown that adhesion to the glass and cell interfaces of PV modules is inferior to EVA, both before and after aging, rendering ionomers particularly susceptible to delamination after short timeframes. Potential solutions to improve ionomer adhesion are discussed.

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离聚物密封剂在光伏组件中的耐久性

摘要 几十年来，乙烯醋酸乙烯酯 (EVA) 一直是光伏 (PV) 模块封装的首选材料。然而，虽然它相对便宜并且最初与模块组件粘附良好，但 EVA 会随着时间的推移而变色，并且随着界面粘附力的降低，容易分层，最终导致模块效率降低和使用寿命缩短。作为 EVA 的潜在替代品，离聚物热塑性材料固化速度更快，更能抵抗变色和潜在诱导降解，并且不会产生腐蚀性乙酸，使其与钙钛矿等新设备材料兼容。由于关于光伏组件应用的离聚物耐久性的信息有限，进行了一系列现场和加速实验室老化研究，以评估离聚物界面在存在陆地环境压力源的情况下的稳定性。结果表明，在老化之前和之后，对 PV 模块的玻璃和电池界面的附着力都不如 EVA，这使得离聚物在短时间内特别容易分层。讨论了提高离聚物附着力的潜在解决方案。