Interface Matters: Boosting Efficient Pb‐Sn Perovskite Solar Cells for All‐Perovskite Tandem Photovoltaics

ABSTRACT To overcome the theoretical efficiency limit of single‐junction perovskite solar cells (PSCs), the development of all‐perovskite tandem solar cells (APTSCs) has attracted significant interest due to their low cost, high efficiency, and compatibility with flexible substrates. Currently, the performance of APTSCs is primarily constrained by the inferior performance of narrow‐bandgap lead‐tin (Pb─Sn) perovskite sub‐cells, stemming from poor interface quality caused by Sn 2+ instability and an unbalanced crystallization process. Encouragingly, recent breakthroughs in rational interface engineering have enabled the construction of high‐quality Pb─Sn perovskite films with optimized interfaces, boosting the…

• NN
  National Natural Science Foundation of China

  Awards: 52202300, 52372226
• SS
  Shenzhen Science and Technology Innovation Program

  Award: JCYJ20240813150819026
• BA
  Basic and Applied Basic Research Foundation of Guangdong Province

  Award: 2024A1515010918