“…Colloidal heteronanocrystals that combine different semiconductors together through a lattice matched heterointerface are widely known for their excellence in surface passivation and engineering optical and electrical properties, which have fueled significant progress for nanocrystals composed of II–VI, III–V, IV–VI, and I–III–V group semiconductors. − Lead halide perovskite nanocrystals (PNCs) have recently emerged as promising candidates for a broad range of applications in light conversion and harvesting because of their remarkable optical and electrical properties, such as high photoluminescent efficiency, high defect tolerance, and significant cost advantage over classical nanocrystals. − However, the soft ionic nature and low formation energy of the perovskites lead to their labile surface and dynamic ligand capping, which induce rapid decomposition and halide ion segregation when the PNCs are exposed in a combination of light, heat, and moisture. , Fabrication of perovskite heteronanocrystals (PHNCs) by growing a semiconductor with more covalent characteristic on ionic PNCs provides enormous benefits, including minimized surface trap states, increased carrier transfer or exciton recombination, widened tuning range of optical and electrical properties, and significantly improved stability. , Over the past years this has spurred an intense research activity to grow PHNCs with metal salts, , metal chalcogenide, , and metal oxides. , …”