Phase-selective redissolution enabling phase-pure 2D/3D perovskite solar cells

Abstract

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.