Surface passivation using tailored organic potassium salts for efficient FAPbI3 perovskite solar cells and modules

• Photocatalytic solar-to-fuel conversion of metal halide perovskites (MHP s) has attracted much attention recently, but the role of defects in MHPs remains controversial. Specifically, the mainstream view is that defects are detrimental to photocatalytic performance, while some recent studies have shown that certain types of defects contribute to photoactivity enhancement. However, there is still a lack of a systematic summary of why it is contradictory and how defects in MHPs affect photocatalytic performance.

  
  

  In this review, Chunhua Wang, Zhirun Xi, and Yun Hau Ng et al. from City University of Hong Kong highlight the innovative roles of defects in MHP photocatalysts. First, the origin of defects in MHPs is elaborated in detail, and then some benefits of defects in photocatalysts, including light absorption, charge dynamics, and surface reactions, are elucidated. Subsequently, the latest progress in defect-related MHP photocatalysis, namely CO2 reduction, H2 generation, pollutant degradation, and organic synthesis, is systematically discussed and critically evaluated, focusing on their beneficial roles.

  
  

  Given that defects have unique advantages and disadvantages, personal opinions on current challenges are summarized and the potential prospects of engineering defects for MHP photocatalysts are outlined. This critical review is expected to contribute to a better understanding of MHP defects and inspire some inspiration for designing efficient MHP photocatalysts.

• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 

• C. Wang, Z. Xie, Y. Wang, Y. Ding, M. K. H. Leung, Y. H. Ng, Defects of Metal Halide Perovskites in Photocatalytic Energy Conversion: Friend or Foe?. Adv. Sci. 2024, 2402471.

  
  

  https://doi.org/10.1002/advs.202402471