Perovskite Nanocrystals Synthesized via Supersaturated Recrystallization at Room Temperature

More than a decade, solution-processable lead halide perovskites (LHPs) have received a surge of attention as a next-generation semiconductor for optoelectronics due to their excellent properties such as high absorption coefficient, long electron-hole diffusion length, tunable bandgap, small exciton binding energy, significant charge mobility, etc. In 2015, all-inorganic LHP nanocrystals (NCs) (CsPbX 3 : X = Cl, Br, I) were designed as a luminescent material via the conventional hot-injection (HI) technique. Then, the ligand-assisted reprecipitation (LARP) method was further developed, including room-temperature supersaturated recrystallization (RT-SR) with potential scalability for commercialization. Hence, this chapter focuses on the RT-SR process. For this purpose, first, the nucleation and growth processes were elucidated using the LaMer model. Second, Hansen solubility parameters were employed as a factor to control the size of LHP NCs. Third, the room-temperature syntheses were exemplified in detail. Fourth, the state-of-the-art size and shape control of LHP NCs via the nucleation-growth decoupling was described as a current area of interest. Finally, the industrial viability of perovskite NCs was clearly addressed from the viewpoint of cost, efficiency, and lifetime, suggesting a future scope of study.