Interfacial Engineering of Perovskite Solar Cells

Abstract

Our systematic investigation of interfacial issues in perovskite solar cells covers film formation kinetics, carrier transport in 2D perovskites, and device stability. In-situ optical characterization during blade coating revealed that sulfonium cations promote intermediate conversion, solvent engineering reduces trap states, and spacer cation tuning releases residual strain, correlating crystallization rate with stress. For quasi 2D perovskites, slow post annealing facilitates energy transfer and carrier transport, while designed slightly displaced Dion–Jacobson materials achieve over 6000 h operational stability. To synergize stability and efficiency, we constructed 2D/3D heterostructures via preformed 2D intermediates, yielding vertically aligned α FAPbI₃ with improved orientation and passivation. This delivered 27.4% device efficiency and 23.58% module efficiency (13.01 cm²), with >95% retention after 1100 h MPP tracking and 1700 h damp heat testing (85% RH, 85 °C).

Keywords

References

1. 1. Zhang, W.; Liu, Z.; Zhang, L.; Wang, H.; Jiang, C.; Wu, X.; Li, C.; Yue, S.; Yang, R.; Zhang, H.; Zhang, J.; Liu, X.; Zhang, Y. ; Zhou, H. * Ultrastable and Efficient Slight-Interlayer-Displacement 2D Dion-Jacobson Perovskite Solar Cells. Nat. Commun. 2024, 15, 5709.
2. 2. Wang B, Cheng Q, Huang G, Yue Y, Zhang W, Li X, Li Y, Du W, Liu X, Zhang H, Zhang Y, Zhou H*, Sulfonium Cations Assisted Intermediate Engineering for Quasi-2D Perovskite Solar Cells, Adv. Mater. 2023, 35, 2207345.