Double passivation! Inverted perovskite solar cells

• Compared with the n-i-p structure, inverted (p-i-n) perovskite solar cells (PSCs) are expected to improve operating stability. However, these photovoltaic cells generally exhibit lower power conversion efficiencies (PCEs) due to non-radiative recombination losses, especially at the perovskite/C60 interface.

  
  

  Academician Edward H. Sargent of Northwestern University, Professor Mercouri G. Kanatzidis, and Bin Chen et al. used two types of functional molecules to passivate surface defects and reflect minority carriers from the interface to the bulk. Sulfur-modified methylthio molecules are used to passivate surface defects and inhibit recombination through strong coordination and hydrogen bonding. At the same time, diammonium molecules are used to repel minority carriers and reduce the damage caused by field effect passivation. Contact induces interfacial recombination.

  
  

  This approach resulted in a five-fold increase in carrier lifetime, a one-third loss in photoluminescence quantum yield, and a certified quasi-steady-state power conversion efficiency PCE of 25.1% for the inverted perovskite solar cell PSC , in an environmental When the air is 65°C, stable operation >2000 hours. A monolithic all-perovskite tandem solar cell with a power conversion efficiency PCE of 28.1% was also prepared.

  
  

  Although inverted perovskite solar cells minimize losses in the hole transport layer, recombination-induced losses occur in the top electron transport layer. This study used two different passivation molecules to solve this problem. Sulfur-modified methylthio molecules provide chemical passivation, while diammonium molecules repel minority charge carriers and reduce contact-induced recombination. The cells feature certified quasi-steady-state power conversion efficiency and stable operation for over 2,000 hours in ambient air at 65°C.

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• https://www.science.org/doi/10.1126/science.adk1633

  
  

  DOI: 10.1126/science.adk1633

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