Overcoming ion migration through alkali metals in perovskite solar cells

• Alkali metals as additives in perovskite solar cells (PSCs) have been widely studied for their effects on performance enhancement. This property is sensitive to ion-driven interfacial recombination processes that result in voltage losses and have negative capacitance features in the impedance spectrum (IS) . Recently, University of StuttgartMichael Saliba, Clara A. Aranda used negative capacitance As tools, Li, Na and were systematically studied K to the light of wide band gap materialMAPbBr3 Voltage effects.

  
  

  
  

  The authors found that sodium cations can alleviate unfavorable interfacial recombination pathways, resulting ina stable open circuit potential of 1.65V. Impedance measurements show that sodium has a significant effect on material volume, as confirmed by femtosecond time secondary ion mass spectrometry andX-ray photoelectron spectroscopy.

  
  

  These techniques confirmedNa’s ability to reduce ion migration in perovskite materials. The author found through X ray photoelectron spectroscopy (XPS) analysis that achieves this function through electrostatic interactions with organic compounds. 

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• Clara A. Aranda et.al Overcoming ionic migration in perovskite solar cells through alkali metals Chem 2023

  
  

  DOI: 10.1016/j.joule.2023.11.011

  
  

  https://doi.org/10.1016/j.joule.2023.11.011