Record efficiency! Efficient, highly stable lateral single-crystal perovskite cells achieved through crystal engineering and weak ion migration

• The lateral device structure of perovskite solar cells (PSCs) has attracted considerable attention, mainly because it eliminates the need for expensive transparent electrodes. However, the performance of lateral devices is more sensitive to crystal quality and carrier transport bottlenecks, and their performance lags far behind that of leading vertical PSC s.

  
  

  Here, Cheng Xiao, Chen Zhaolai and others from Shandong University improved the crystal quality and carrier transport by adjusting the crystal nucleation and growth process of thin FA0.75MA0.25PbI3 (FA = formamidine ; MA = methylammonium ) single crystal. , resulting in a power conversion efficiency (PCE ) of 12.64%, a record efficiency for lateral PSCs. Studies on device stability showed that iodide ion migration was inhibited due to reduced iodine vacancy concentration and weaker interfacial iodide ion migration.

  
  

  It was shown that the latter effect is a consequence of ion migration in the vertical and transverse directions of the electric field in the PSC. As a result, these lateral single-crystalline PSCs show excellent operational stability, maintaining 100% of their initial PCE after stable output at maximum power point voltage (Vmpp) for 1200 hours under 1 solar illumination. This work highlights the advantages of lateral single-crystal devices and their potential to solve critical ion migration issues in PSCs.

  
  

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• D. Li, N. Li, C. Zou, Y. Zhong, Y. Qu, S. Yang, L. Wang, Y. Chen, X. Cheng, X. Tao, O. M. Bakr, Z. Chen, Efficient and Highly Stable Lateral Perovskite Single-Crystal Solar Cells through Crystal Engineering and Weak Ion Migration. Adv. Funct. Mater. 2024, 2313693.

  
  

  https://doi.org/10.1002/adfm.202313693