NiOx interface modification for efficient and stable inverted perovskite solar cells

• Nickel oxide is one of the effective hole transport materials in inverted perovskite solar cells ( PSC ), but it reacts with perovskite, resulting in low device performance and stability. Self-assembled monolayer ( SAM ) can effectively optimize the NiOx / perovskite interface. Chen Hongzheng and Fu Weifei of Zhejiang University, Wang Yao of Zhejiang University of Technology, Wang Yang of Fujian Normal University and others used a series of benzoic acid, 2- fluorobenzoic acid and meta- Phthalic acid is the anchoring group of methoxy-substituted triphenylamine-functionalized benzothiadiazole ( TBT )-based SAM molecules, TBT-BA , TBT-FBA and TBT-DBA to modify NiOx .

  
  

  TBT-BA, which has the simplest structure, forms the densest SAM on NiOx , thereby optimizing the NiOx/SAM/ perovskite interface, enhancing charge collection, and suppressing interface reactions and recombination. Due to its highest binding energy to perovskite, TBT-BA can also passivate perovskite most effectively.

   In the glove box, the inverted PSC still had the highest PCE of 24.8% after 2635 hours of storage at 60 ° C and maintained 88.7% of the initial PCE . This work provides important insights into the design of SAM molecules for efficient stabilization of PSC- modified transport layers .

  
  
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• Yu Zhou et.al Interfacial Modification of NiOx for Highly Efficient and Stable Inverted Perovskite Solar Cells Adv. Energy Mater. 2024

  DOI:  10.1002/aenm.202400616

  https://doi.org/10.1002/aenm.202400616