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-FAPbI₃) 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.