Publication date: 4th October 2024
Optimizing the interface between two-dimensional (2D) and three-dimensional (3D) perovskite layers is crucial for enhancing the performance and stability of perovskite solar cells (PSCs). Incorporating 2D perovskite atop 3D films effectively suppresses interfacial recombination and impedes ion migration, both of which are essential for improving efficiency and longevity. However, the uncontrolled and spontaneous formation of 2D perovskite layers often leaves residual 2D ligands on the surface, disrupting charge extraction and transport pathways. This issue limits the maximum achievable efficiency and compromises the long-term stability of PSCs.
To address these challenges, we developed a surface cleaning and passivation strategy to effectively remove residual 2D ligands from the perovskite surface. This approach reorganizes the 2D/3D perovskite interface into a clean and uniform structure, significantly reducing energetic disorder and enabling more efficient charge transport and extraction. Compared to conventional 2D/3D perovskite systems, the reconstructed interface exhibits superior optoelectronic properties, achieving remarkable improvements in performance (~26% power conversion efficiency) and stability.
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