Intermarriage of Halide Perovskites and Metal‐Organic Framework Crystals

This Review examines how the intermarriage of perovskite and metal‐organic framework crystals brings new paradigms for material design and functionality. The strategic combination of halide perovskites and metal–organic frameworks (MOFs) has generated a new family of porous composite materials that will enable new applications, including optoelectronic, catalysis, sensing, and data encryption. This Review surveys the current progress of this exciting new area. Fundamental aspects, including perovskite nucleation and growth, heterojunction electron–hole transfer, electronic structure, and luminescence within confined spaces, are highlighted, with suggestions of approaches by which guest confinement within MOFs can be synthetically designed. We further address the underlying principles and discuss the new insights and tools for the manipulation of these composite materials for the development of synthetic microporous semiconducting composites, as well as new strategies for host–guest interfacial engineering. Both metal‐organic frameworks and halide perovskites are important functional materials with significant scientific and industrial interest. The composite formed between these materials provides novel applications and synergistic functions. This Review introduces fundamental design principles and provides thoughts on future progress and key unanswered questions in this field.