Highly stable flexible perovskite solar modules

• Perovskite solar cells are moving toward commercialization, with efficiency and stability at the module level improving rapidly. The strong absorption of metal halide perovskites allows thin film perovskites to be used to absorb most of the sunlight above their optical band gap, which also enables perovskites to be applied in flexible perovskite solar cells (F-PSCs ). However, the poor quality of the buried perovskite-substrate interface due to the low interfacial adhesion and large deformation of the flexible substrate greatly limits the performance of flexible perovskite solar cells.

  
  

  Professor Huang Jinsong’s team at the University of North Carolina reported that entinostat, an organic molecule, was added to the hole extraction material PTAA through the multifunctional group between entinos tat (entinostat) and perovskite, PTAA and tin indium oxide The interaction enhances the adhesion of the perovskite-substrate interface. In addition, entinostat reduces the density of voids at the bottom of the perovskite film by regulating the crystallization of perovskite.

  
  

  The researchers also demonstrated an inverted small-area flexible perovskite solar cell with a conversion efficiency of 23.4%. The flexible perovskite mini-module with an area of ​​9 cm2 achieved a certified aperture efficiency of approximately 19.0%. The optimized unencapsulated flexible mini-module maintained an initial efficiency of 84% after 5,000 bending cycles and an initial power conversion efficiency of 90% after more than 750 hours of illumination.

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• Xu, W., Chen, B., Zhang, Z. et al. Multifunctional entinostat enhances the mechanical robustness and efficiency of flexible perovskite solar cells and minimodules. Nat. Photon. (2024).

  
  

  https://doi.org/10.1038/s41566-023-01373-z