High‐Efficiency Perovskite Solar Cells with Improved Interfacial Charge Extraction by Bridging Molecules

Abstract The interface between the perovskite layer and electron transporting layer is a critical determinate for the performance and stability of perovskite solar cells (PSCs). The heterogeneity of the interface critically affects the carrier dynamics at the buried interface. To address this, a bridging molecule, (2‐aminoethyl)phosphonic acid (AEP), is introduced for the modification of SnO 2 /perovskite buried interface in n–i–p structure PSCs. The phosphonic acid group strongly bonds to the SnO 2 surface, effectively suppressing the surface carrier traps and leakage current, and uniforming the surface potential. Meanwhile, the amino group influences the growth of perovskite film, resulting in higher…

• NN
  National Natural Science Foundation of China

  Awards: U23A20138, U23B20153
• NK
  National Key Research and Development Program of China

  Award: 2022YFB3803304