One-Pot Synthesis and Structural Evolution of Colloidal Cesium Lead Halide–Lead Sulfide Heterostructure Nanocrystals for Optoelectronic Applications

Heterostructures, combining perovskite nanocrystals (PNC) and chalcogenide quantum dots, could pave a path to optoelectronic device applications by enabling absorption in the near-infrared region, tailorable electronic properties, stable crystal structures. Ideally, heterostructure host material requires similar lattice constant as guest which is also constrained synthesis protocol materials selectivity. Herein, we present an efficient one-pot hot-injection method synthesize colloidal all-inorganic cesium lead halide–lead sulfide (CsPbX3 (X = Cl, Br, I)–PbS) (HNCs) via epitaxial growth of onto presynthesized PbS (NCs). Optical structural characterization evidenced formation heterostructures. The embedding NCs into CsPbX3 allows tuning emission from 400 1100 nm size composition HNCs. CsPbI3–PbS HNCs show enhanced stability ambient conditions. stability, tunable optical variable band alignments accessible this system would have implications design novel such light-emitting diodes, photodetectors, photocatalysis, photovoltaics.