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Updated: May 10, 2025

Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
Origin of Intrinsic Chirality in Cysteine-Passivated Metal Halide Perovskite Nanoclusters
Celia F Todd1, David Zeitz1, Jin Z Zhang1
1Department of Chemistry and Biochemistry, University of California, Santa Cruz, 590 Steinhart Way, Santa Cruz, CA, 95064, USA.
Abstract:
Ligand-assisted perovskite nanoclusters (PNCs) have been synthesized using oleylamine and L- or D-cysteine as confirmed based on their characteristic electronic absorption bands around 430 nm based on ultraviolet-visible spectra. Circular dichroism (CD) spectra show distinct chiroptical bands in the 430-440 nm region, revealing the chirality of the PNCs. Interestingly, the sign of the CD signal is always negative, independent of the chirality for L- or D-cystine. This 430-440 nm CD band is tentatively attributed to the formation of new chiral stereocenters within the PNCs with an uneven ratio of two enantiomers induced by the asymmetric liquid-liquid interface from the solvent and antisolvent used during synthesis.
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