Self‐Induced Bi‐interfacial Modification via Fluoropyridinic Acid For High‐Performance Inverted Perovskite Solar Cells

Abstract The uncontrolled crystallization of perovskite generates a significant number of internal and interfacial defects, posing a major challenge to the performance of perovskite solar cells (PSCs). In this paper, a novel bi‐interfacial modification strategy utilizing 5‐fluoropyridinic acid (FPA) is proposed to modulate crystal growth and provide defect passivation. It is demonstrated that FPA is self‐deposited at both the top and bottom interfaces of perovskite films during thermal annealing. The CO and N functional groups in FPA serve as chelating agents, binding closely to uncoordinated Pb 2+ /Pb clusters, thereby passivating defects and reducing charge recombination at the interfaces. The strong…

• NN
  National Natural Science Foundation of China

  Awards: 62204103, 62274018
• MS
  Major Scientific and Technological Special Project of Guizhou Province

  Award: Grant no.202202AG050017‐1
• MS
  Major Science and Technology Projects in Yunnan Province

  Award: 202101BE070001‐007