Issue 5, 2023

Size-dependent chiro-optical properties of CsPbBr3 nanoparticles

Abstract

Chiral metal halide perovskites have garnered substantial interest because of their promising properties for application in optoelectronics and spintronics. Understanding the mechanism of chiral imprinting is paramount for optimizing their utility. To elucidate the nature of the underlying chiral imprinting mechanism, we investigated how the circular dichroism (CD) intensity varies with nanoparticle size for quantum confined sizes of colloidal CsPbBr3 perovskite nanoparticles (NPs) capped by chiral β-methylphenethylammonium bromide ligands. We find that the CD intensity decreases strongly with increasing NP size, which, along with the shape of the CD spectra, points to electronic interactions between ligand and NP as the dominant mechanism of chiral imprinting in smaller NPs. We observe that as the NP size increases and crosses the quantum confinement threshold, the dominant mechanism of chirality transfer switches and is dominated by surfaces effects, e.g., structural distortions. These findings provide a benchmark for quantitative models of chiral imprinting.

Graphical abstract: Size-dependent chiro-optical properties of CsPbBr3 nanoparticles

Supplementary files

Article information

Article type
Paper
Submitted
02 Dec. 2022
Accepted
29 Dec. 2022
First published
29 Dec. 2022

Nanoscale, 2023,15, 2143-2151

Author version available

Size-dependent chiro-optical properties of CsPbBr3 nanoparticles

N. Tabassum, Z. N. Georgieva, G. H. Debnath and D. H. Waldeck, Nanoscale, 2023, 15, 2143 DOI: 10.1039/D2NR06751J

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