Effect of film morphology on circular dichroism of low-dimensional chiral hybrid perovskites

Chiral hybrid lead halide perovskites show interesting chiral optoelectronic properties. The extent of chirality is often estimated by their circular dichroism (CD) response. Here, we show that the CD data depend strongly on film morphology. Four of the six chiral hybrid lead halide films prepared,...

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Bibliographic Details
Published in:The Journal of chemical physics 2024-01, Vol.160 (2)
Main Authors: Makhija, Urmila, Rajput, Parikshit Kumar, Parthiban, Pavithra, Nag, Angshuman
Format: Article
Language:English
Subjects:
Chirality
Dichroism
Lead compounds
Metal halides
Morphology
Optoelectronics
Perovskites
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Summary:Chiral hybrid lead halide perovskites show interesting chiral optoelectronic properties. The extent of chirality is often estimated by their circular dichroism (CD) response. Here, we show that the CD data depend strongly on film morphology. Four of the six chiral hybrid lead halide films prepared, 2D (R- and S-MBA)2PbI4 and 1D (R- and S-MBA)PbI3 (MBA: methylbenzylammonium), form homogenous non-textured films and show an isotropic CD signal. In contrast, the other two samples, 1D (R- and S-MBA)PbBr3, form textured films, showing uncorrelated CD signals from different parts of the film. Therefore, the role of film morphology needs to be verified before designing and comparing the chiroptic and chiral optoelectronic properties of hybrid perovskites.
ISSN:0021-9606
1089-7690
DOI:10.1063/5.0185850