Recent Advances in Interface Engineering to Stabilize Formamidinium‐Based Perovskite Solar Cells

Formamidinium (FA)‐based perovskite solar cells (PSCs) have attracted particular attentions because of the superb photovoltaic performance, low material costs, and facile fabrication procedures. However, the intrinsic instability of photoactive black‐phase formamidinium lead iodide (α‐FAPbI 3 ) predominantly limits the large‐scale applications of FA‐based PSCs. Herein, the recent advancements in interface engineering to stabilize FA‐based PSCs are reviewed by emphasizing the importance of phase stabilization and the superiority of interface engineering over other stabilization strategies/methods for FA‐based PSCs. Additionally, several distinct strategies based on interface engineering are presented to boost the durability and power conversion efficiencies of FA‐based PSCs. Finally, the existed challenges, remained crucial issues and future trends about the interface engineering strategy to stabilize FA‐based PSCs are also provided and discussed, aiming to provide valuable insights for designing and fabricating high‐efficiency and durable FA‐based PSCs.