Highly oriented FAPbI3 grown via 2D Ruddlesden Popper perovskite template

• Two-dimensional perovskites have been demonstrated to serve as growth templates for regulating the phase transition and crystallization of formamidinium lead triiodide (FAPbI3 ). However, obtaining highly oriented α-FAPbI3 and regulating the crystallization at the bottom of FAPbI3 films are challenging.

  
  

  Here, Anran Yu, Yiqiang Zhan and others from Fudan University introduced a 2D (BA) 2 PbI 4 layer with preferred orientation as the bottom template for the quasi-epitaxial growth of FAPbI 3, thereby triggering the formation of α-FAPbI 3 perovskite. Due to the assembly of [PbI6]4− octahedra on the 2D template, a highly (100)-oriented FAPbI3 perovskite from bottom to top was obtained.

  
  

  At the optimal concentration, the 2D perovskite gradually disappears due to the extrusion of BA+ cations from the template, ensuring the charge transport at the bottom. Therefore, this strategy effectively improves the film quality and suppresses non-radiative recombination. The efficiency of the perovskite solar cell (PSC ) is improved from 23.06% to 24.78%.

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• Y. Wang, Z. Shi, Y. Wang, J. Zhang, X. Zhang, X. Li, H. Wang, C. Li, J. Wang, H. Zhang, Y. Yang, J. Zhang, A. Yu, Y. Zhan, Highly Oriented FAPbI3 via 2D Ruddlesden Popper Perovskite Template Growth. Adv. Energy Mater. 2024, 2401721.

  
  

  https://doi.org/10.1002/aenm.202401721