Intrinsic Chiroptical Evolution in Perovskite Nanocrystals

TL;DR

Researchers discovered that perovskite nanocrystals can develop intrinsic chirality during their synthesis, offering new ways to design chiral nanostructures.

Contribution

A steric-delayed nucleation strategy enables observing and enhancing intrinsic chirality in perovskite nanocrystals.

Findings

Chiroptical evolution occurs during perovskite nanocrystal synthesis via ligand displacement and self-assembly.

Ligands bind to nanocrystal surfaces and dissociate during ripening, creating a window for chirality observation.

The study introduces a new method to design intrinsically chiral perovskite nanostructures.

Abstract

Here, we observed
chiroptical evolution during the synthesis of
perovskite nanocrystals (NCs). Using a steric-delayed nucleation strategy,
we slowed the ripening of NCs and observed changes in the circular
dichroism (CD) signal of perovskite NCs. Two chiroptical evolution
events occurred during NC formation under different conditions, attributed
to ligand displacement and NC self-assembly, respectively. Surface
characterization and computational studies demonstrate that the ligands
initially bind to the NC surface and dissociate during the ripening
stage, offering the time window to observe and enhance the intrinsic
chirality. Our findings provide a new strategy for studying and designing
intrinsically chiral perovskite nanostructures.

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