Enlarging moment and regulating orientation of buried interfacial dipole for efficient inverted perovskite solar cells

Carrier transport and recombination at the buried interface of perovskite have seriously restricted the further development of inverted perovskite solar cells (PSCs). Herein, an interfacial dipolar chemical bridge strategy to address this issue is presented. 2-(Diphenylphosphino) acetic acid (2DPAA) is selected as the linker to reconstruct the interfacial dipole, which effectively enlarges the interfacial dipole moment to 5.10 D and optimizes to a positive dipole orientation, thereby accelerating vertical hole transport, suppressing nonradiative recombination and promoting the perovskite crystallization. The champion inverted device yields a high power conversion efficiency (PCE) of 26.53% (certified 26.02%).…

• NN
  National Natural Science Foundation of China

  Awards: 22379101, 22075190, 22379101, 22075190, 22409020
• CU
  Chengdu University of Technology

  Award: 11400-000525-08
• CU
  Chengdu University
• NS
  Natural Science Foundation of Sichuan Province

  Awards: 2024NSFSC1163, 2024NSFSC0001
• NK
  National Key Research and Development Program of China

  Award: 2022YFB4200500