Co‐Self‐Assembled Monolayers Modified NiO x for Stable Inverted Perovskite Solar Cells

Abstract [4‐(3,6‐dimethyl‐9H‐carbazol‐9yl)butyl]phosphonic acid (Me‐4PACz) self‐assembled molecules (SAM) are an effective method to solve the problem of the buried interface of NiO x in inverted perovskite solar cells (PSCs). However, the Me‐4PACz end group (carbazole core) cannot forcefully passivate defects at the bottom of the perovskite film. Here, a Co‐SAM strategy is employed to modify the buried interface of PSCs. Me‐4PACz is doped with phosphorylcholine chloride (PC) to form a Co‐SAM to improve the monolayer coverage and reduce leakage current. The phosphate group and chloride ions (Cl − ) in PC can inhibit NiO x surface defects. Meantime, the quaternary ammonium ions and Cl − in PC can fill organic…

• NN
  National Natural Science Foundation of China

  Award: 22305191
• RG
  Research Grants Council, University Grants Committee

  Award: 15306822
• HK
  Hong Kong Polytechnic University