interface to suppress the ion migration by increasing the corresponding activation energy. Various characterizations have proved that halogen-halogen bonds form between 2D and 3D phases, which do suppress the halide segregation. As expected, the encapsulated device retains 90% of initial power conversion efficiency (PCE) after maximum power point (MPP) tracking for ∼500 h under continuous simulated 1-sun
混合卤化物钙钛矿提供带隙可调性,这对于串联太阳能电池应用至关重要。然而,离子迁移引起的相分离严重影响了器件的长期运行稳定性。因此,该问题代表了整个钙钛矿社区的重要挑战,迫切需要有效的解决方案。我们在这里首次展示了在相界面引入了强化学相互作用,即卤素 - 卤素键,通过增加相应的活化能来抑制离子迁移。各种表征已经证明在 2D 和 3D 相之间形成卤素 - 卤素键,这确实抑制了卤化物偏析。正如预期的那样,