• Tailored n-Value Engineering of Dion-Jacobson 2D Layers Enables Efficient and Stable Perovskite Solar Cells
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  • 2026-03-25 09:49:51|
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ㅇ [Title]         Tailored n-Value Engineering of Dion-Jacobson 2D Layers Enables Efficient and Stable Perovskite Solar Cells
  

ㅇ [Journal]    Joule
                                                                         

ㅇ [Author]     Jaehee Lee†, Chan Su Moon†, Youngwoong Kim, Young Yun Kim, Eun Young Park, Jason J. Yoo, Geunjin Kim, Hyunjun Lee, Hajin Na, Junho Park, Deokhyun Yoon, Fabian

                              Rotermund, Eun Sung Oh, Taek-Soo Kim, Seulki Song, Tae Joo Shin, Jun Hong Noh, Nam Joong Jeon*, Jangwon Seo*
 

ㅇ [Abstrct]


The formation of a two-dimensional (2D) perovskite on the perovskite surface is one of the most effective defect control approaches in perovskite solar cells. To date, in most high-

efficiency perovskite devices, surface defect passivation still relies on Ruddlesden–Popper (RP)-based 2D passivation, even though these structures suffer from instability under

environmental and operational stressors. Herein, we present a robust Dion–Jacobson (DJ) 2D passivation layer to address the stability limitations of its RP counterparts. We found that the

n-value of the DJ 2D perovskite could be finely tuned using a precise post-annealing process. By carefully tailoring the n value, we were able to overcome the intrinsically low conductivity

of the DJ framework and significantly boost hole extraction at the interface. Benefiting from these advances, our optimized device achieved a power conversion efficiency of 25.56%

(certified 25.59%), while maintaining high stability in both damp-heat and  operational-stability tests.


 
 


 
 
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