(637e) Invited: Perovskite Nanocrystals: From Self-Assembly to Exciton Dynamics

Perovskite nanocrystals (PNCs) has emerged as a game-changer within the class of semiconducting quantum dots and has been realized in a multitude of optoelectronic technologies. In this talk I will demonstrate how the properties of PNCs can be tuned by modulating their spatial distribution, and by manipulating their composition and morphology. We have shown PNCs can be strategically self-assembled by altering the polarity of the solvent. PNCs dispersed in hexane (polarity index 0.6) resulted in 1D superlattice chains whereas PNCs dispersed in toluene (polarity index 2.4) gave rise to short-range 2D assemblies. Further we have shown the electronic properties of PNCs including the radiative decay rate, bandgap renormalization energy, hot carrier cooling rate, Auger recombination rate, and trap–assisted recombination rate can be controllably modulated by either Cl substitution in the CsPbBr₃ nanocrystal lattice, or by changing the shape of the PNCs from nanocubes to nanowires. We also show that both morphology and composition of PNCs has a profound effect on the hot-phonon bottleneck effect and Burstein-Moss effect. The findings of our work will provide a generalized framework to guide researchers how to spatially and chemically control PNCs for high performance optoelectronic technologies.