Interconnection layers (ICLs) serve as critical components in monolithic perovskite‐based tandem solar cells (Pe‐TSCs), determining the series connection between the top and bottom sub‐cells. ICLs have garnered considerable attention, with numerous studies focusing on their experimental effects. However, their operational mechanism and overall impact on Pe‐TSCs remain underexplored. This review elucidates the structure and functionality of ICLs, distinguishing the working mechanisms between Pe‐TSCs and traditional multijunction solar cells. The carrier injection balance around ICLs and its impact on the tandem device performance is delved into. The discussion also encompasses current advancements of ICLs within Pe‐TSCs, and focuses on the uniqueness of ICLs in Pe‐TSCs and evaluation methods. Finally, the requirements of ICLs in Pe‐TSCs are proposed, and provide cogitations about the potential designs and stability of ICLs. This review not only deepens the physical understanding of ICLs but also broadens the research scope in tandem photovoltaics.

中文翻译：

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基于单片钙钛矿的叠层光伏互连层的原理与进展


互连层 （ICL） 是单片钙钛矿基串联太阳能电池 （Pe-TSC） 中的关键组件，决定了顶部和底部子电池之间的串联连接。ICLs 引起了相当大的关注，许多研究都集中在它们的实验效果上。然而，它们的运行机制和对 Pe-TSCs 的整体影响仍未得到充分探索。本文阐明了 ICL 的结构和功能，区分了 Pe-TSCs 和传统多结太阳能电池之间的工作机制。深入研究了围绕 ICL 的载流子注入平衡及其对串联器件性能的影响。讨论还包括 Pe-TSCs 中 ICLs 的当前进展，并侧重于 Pe-TSCs 中 ICLs 的独特性和评估方法。最后，提出了 Pe-TSCs 中 ICLs 的要求，并提供了关于 ICL 的潜在设计和稳定性的思考。本文不仅加深了对 ICLs 的物理理解，也拓宽了串联光伏的研究范围。