Effective interface engineering of highly efficient and stable FAPbI3 perovskite cells by suppressing deprotonated peptide ammonium halides

• Ammonium iodide has been widely studied as an effective interface passivator for perovskite solar cells (PSCs), but its high reactivity with perovskite can destroy the operational stability of PSCs.

  
  

  By introducing rationally designed/selected peptides into the widely adopted phenethylammonium iodide (PEAI), Chen Ruihao, Wang Hongqiang and others from Northwestern Polytechnical University can effectively inhibit the deprotonation of ammonium iodide through customized peptide-PEAI, thereby hindering the formation of two-dimensional perovskites and promoting the stability of perovskite films through multiple hydrogen bonds. The additional lone pair electrons provided by the peptide molecules can also enhance the passivation ability of the modified layer.

  
  

  Due to the stable co-modified peptide PEAI, small-area PSCs based on FAPbI3 produced a high efficiency of 25.02% and exhibited good photo- and thermal stability. In addition, the peptide-PEAI-based micromodule achieved an efficiency of 19.06% over a total area of ​​36 cm2, demonstrating the great application potential of this co-modification strategy in the field of perovskite photovoltaics .

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• C. Liu, L. Ma, P. Zhao, L. Yuan, F. Li, Z. Fang, Q. Chang, N. Jia, P. Guo, F. Guo, Z. Liu, R. Chen, H. Wang, Peptide-Based Ammonium Halide with Inhibited Deprotonation Enabling Effective Interfacial Engineering for Highly Efficient and Stable FAPbI3 Perovskite Solar Cells. Adv. Funct. Mater. 2024, 2405735.

  
  

  https://doi.org/10.1002/adfm.202405735