Dipolar Chemical Bridge Induced CsPbI 3 Perovskite Solar Cells with 21.86 % Efficiency

Abstract CsPbI 3 perovskite receives tremendous attention for photovoltaic applications due to its ideal band gap and good thermal stability. However, CsPbI 3 perovskite solar cells (PSCs) significantly suffer from photovoltage deficits because of serious interfacial energy losses within the PSCs, which to a large extent affects the photovoltaic performance of PSCs. Herein, a dipolar chemical bridge (DCB) is constructed between the perovskite and TiO 2 layers to lower interfacial energy losses and thus improve the charge extraction of PSCs. The results reveal that the DCB could form a beneficial interfacial dipole between the perovskite and TiO 2 layers, which could optimize the interfacial energetics of…

• NN
  National Natural Science Foundation of China

  Award: 52372169 and 51872014
• NK
  National Key Research and Development Program of China

  Award: 2022YFB3807200