Indium-Based Octahedra Coordinating Pb–I Termini for Stable Perovskites (opens in new tab)

Halide perovskite degradation initiates at surfaces/interfaces, where defect accumulation disrupts octahedral connectivity and triggers structural collapse. Herein, we design an indium-based octahedral motifs, i.e., (PMA)4InCl7 (PIC) (PMA=phenylmethylammonium) featuring disordered octahedra and (PMA)4NaInCl8 (PNIC) with ordered octahedral frameworks, as robust coordination agent to bind Pb-I termini at the surface/interface. Distinct from the isolated cluster of PIC, PNIC forms a coherent ino...