AFM: Silver electrode anti-corrosion! The good news for inverted perovskite cells

• Silver electrodes are widely used in inverted perovskite solar cells (PSCs), but their reactivity and corrosiveness with perovskites always cause serious stability problems. Starting from the typical theory of metal anti-corrosion, Fang Junfeng, Li Xiaodong, Ouyang Wei and others from East China Normal University reported a method for chemical anti-corrosion of silver electrodes in inverted PSCs by introducing 2-mercaptobenzothiazole (MBT) as a corrosion inhibitor. Due to the N atoms and exocyclic thiol groups in the thiazole ring, MBT can bind strongly to Ag and form dense [MBT-Ag] chains on the Ag surface.
  

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• As a result, the anti-corrosion ability of Ag is greatly enhanced by increasing the corrosion potential and reducing the corrosion current, thereby effectively inhibiting possible chemical reactions and corrosion between the perovskite and the Ag electrode. PSCs containing MBT/Ag showed a high efficiency of over 23% and good stability, maintaining an initial efficiency of 95 ± 4.1% after 3800 hours of storage in the glove box. Importantly, the resulting PSC also exhibited excellent thermal stability, retaining an initial efficiency of 90 ± 1.8% after aging at 85 °C for 900 hours.
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• Liu, A., Li, X., Zhang, W., Yang, H., Guo, X., Lu, C., Yuan, H., Ou-Yang, W., Fang, J., Ag Electrode Anticorrosion in Inverted Perovskite Solar Cells. Adv. Funct. Mater. 2023, 2307310. 

  
  

  https://doi.org/10.1002/adfm.202307310

  
  

  https://onlinelibrary.wiley.com/doi/10.1002/adfm.202307310