Reducing nonradiative recombination for highly efficient inverted perovskite solar cells via a synergistic bimolecular interface

Abstract Reducing interface nonradiative recombination is important for realizing highly efficient perovskite solar cells. In this work, we develop a synergistic bimolecular interlayer (SBI) strategy via 4-methoxyphenylphosphonic acid (MPA) and 2-phenylethylammonium iodide (PEAI) to functionalize the perovskite interface. MPA induces an in-situ chemical reaction at the perovskite surface via forming strong P-O-Pb covalent bonds that diminish the surface defect density and upshift the surface Fermi level. PEAI further creates an additional negative surface dipole so that a more n-type perovskite surface is constructed, which enhances electron extraction at the top interface. With this cooperative surface…

• NS
  National Science Foundation
• NN
  National Natural Science Foundation of China

  Awards: 62321166653, 52261145698, 62322407, 62125402, 22279034
• CP
  China Postdoctoral Science Foundation

  Awards: 2022M720742, BX20220089
• LU
  Linköpings Universitet

  Award: 200900971
• JU
  Jilin University
• NK
  National Key Research and Development Program of China

  Award: 2022YFB3803300