Using trifunctional passivators to modulate efficient and stable perovskite/silicon tandem solar cells

• Perovskite / silicon tandem solar cells ( TSC ) have received widespread attention in recent years. One of the keys to achieve efficient and stable TSC is to ensure effective charge transfer, especially on rough-textured silicon substrates due to poor adhesion between interlayers. Cui Xudong of the China Institute of Engineering Physics , Liu Mingzhen of the University of Electronic Science and Technology of China , Liu Zhengxin of the Chinese Academy of Sciences and others used 2- having fluorine ( -F ), carboxylic acid ( -COOH ) and pyridine nitrogen as functional groups in the perovskite precursor. Fluorisonicotinic acid ( 2-FNA ) additive to assist the crystallization process.

  
  

  2-FNA effectively reduces defects and inhibits non-radiative recombination of the perovskite layer by combining with uncoordinated Pb ions, formamidine ( FA + ) and halide vacancies, thereby significantly extending the carrier lifetime. The authors found that 2-FNA helps form better interfacial contact between the perovskite and the top C60 layer , thereby enhancing interfacial electron extraction therein.
  

  
  

  In addition, the power conversion efficiency ( PCE ) of the perovskite / silicon TSS increased from 27.08% in the control to 28.61% . This work provides an effective way to further improve the photovoltaic performance and applicability of perovskite / silicon TSS .

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• Tian Yang et.al Efficient and Stable Perovskite/Silicon Tandem Solar Cells Modulated with Triple-Functional Passivator Adv. Energy Mater. 2023

  
  

  DOI: 10.1002/aenm.202303149

  
  

  https://doi.org/10.1002/aenm.202303149