We present a phase-selective redissolution strategy that directs MA-based 2D perovskites into phase-pure FA-based 2D/3D heterostructures. This approach overcomes intrinsic multiphase issues and enables efficient defect management. The resulting devices achieve 25.02% efficiency and demonstrate outstanding long-term stability under thermal stress.
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K. Guo, G. Gao, M. Hu, T. Hou, A. Zhou, D. Xu and G. Wu, Chem. Commun., 2025, Accepted Manuscript , DOI: 10.1039/D5CC05381A
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