Realization of highly stable core-shell halide perovskite quantum dots

Halide perovskite quantum dots (PQDs) have attracted a lot of attention in various applications, including light-emitting diodes (LEDs), solar cells, bio-imaging, and photodetectors due to their excellent photoelectric properties. However, the poor structural stabilities of PQDs under external stimuli (e.g., moisture, heat, UV) are the weakness that needs to be addressed for commercialization. The structural degradation of PQDs is mainly caused by the formation of vacancies due to ion migration (intrinsic) and detachment of weakly binding ligands on the surface (extrinsic). In this work, the PQDs with high structural stabilities were fabricated by various methods including (1) core-shell structure (2) alkali metal doping, and (3) ligand passivation.