Highest FF! Bilateral chemical connection of NiOx buried interface realizes efficient and stable inverted perovskite cells and components

• Inverted NiOx -based perovskite solar cells (PSCs ) have shown considerable potential due to their low-temperature processing and excellent stability, but face challenges in buried interface carrier transfer due to the intrinsically low carrier mobility and abundant surface defects that directly reduce the overall device fill factor.

  
  

  Chen Ruihao and Wang Hongqiang of Northwestern Polytechnical University rationally designed 1,3-dimethyl-benzimidazole-2-thione (NCS) molecules and demonstrated a chemical linker that can capture NiOx and perovskite crystals simultaneously , which significantly promotes carrier transfer by forming Ni-S-Pb bridges at the buried interface. The constructed buried interface not only reduces the pinholes and needle-like residual PbI 2 at the buried interface, but also deepens the work function and the maximum position of the valence band of NiOx, resulting in a smaller VBM shift between NiOx and the perovskite film. As a result, the modulated PSCs achieved a high filling factor of 86.24%, which is the highest filling factor currently known for NiOx-based inverted PSCs.

  
  

  NCS’s customized PSCs and micromodules (with an active area of ​​18 cm2) achieved championship efficiencies of 25.05% and 21.16%, respectively. Under 1,700 hours of continuous illumination, the unpackaged device still maintained more than 90% of its initial efficiency at the maximum power point.

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• Yang Yang, Ruihao Chen, et. al,. Bilateral Chemical Linking at NiOx Buried Interface Enables Efficient and Stable Inverted Perovskite Solar Cells and Modules

  
  

  10.1002/ange.202409689

  
  

  https://onlinelibrary.wiley.com/doi/10.1002/ange.202409689