Ligand Coverage and Exciton Delocalization Control Chiral Imprinting in Perovskite Nanoplatelets
Abstract
Chiral perovskites have generated significant recent interest, yet little is known about how their chiro-optical properties arise. In this study, chiral methylammonium lead halide perovskite nanoplatelets (NPLs) with varied halide and ligand compositions are prepared using direct synthetic methods. Circular dichroism (CD) and 1H NMR studies find a non-linear relationship between the chiroptical properties and the ratio of chiral phenylethylammonium (PEA) to achiral octylamine (OA) ligands on the NPL surface. We use density functional theory (DFT) computations and a chiral imprinted particle-in-a-box model to rationalize the experimentally observed CD spectra and find that the saturation point of the induced chirality depends on the size of the perovskite exciton relative to the size of the ligands. Temperature-dependent CD and 1H NMR studies, combined with DFT analysis, show that both the CD intensity and sign depend strongly on the structure and orientation of the ligands. Furthermore, this work reveals the complex nature of chiral imprinting in perovskite nanostructures and establishes a simple physical model for ligand-induced chiral imprinting to guide the further development of chiral materials.
- Authors:
-
- Univ. of Pittsburgh, PA (United States)
- Duke Univ., Durham, NC (United States)
- Publication Date:
- Research Org.:
- Univ. of Pittsburgh, PA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1905454
- Grant/Contract Number:
- FG02-07ER46430; SC0010662
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physical Chemistry. C
- Additional Journal Information:
- Journal Volume: 126; Journal Issue: 37; Journal ID: ISSN 1932-7447
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; chirality; perovskite; chiral exciton; excitons; ligands; nanoparticles
Citation Formats
Georgieva, Zheni N., Zhang, Zhendian, Zhang, Peng, Bloom, Brian P., Beratan, David N., and Waldeck, David H. Ligand Coverage and Exciton Delocalization Control Chiral Imprinting in Perovskite Nanoplatelets. United States: N. p., 2022.
Web. doi:10.1021/acs.jpcc.2c04192.
Georgieva, Zheni N., Zhang, Zhendian, Zhang, Peng, Bloom, Brian P., Beratan, David N., & Waldeck, David H. Ligand Coverage and Exciton Delocalization Control Chiral Imprinting in Perovskite Nanoplatelets. United States. https://doi.org/10.1021/acs.jpcc.2c04192
Georgieva, Zheni N., Zhang, Zhendian, Zhang, Peng, Bloom, Brian P., Beratan, David N., and Waldeck, David H. Tue .
"Ligand Coverage and Exciton Delocalization Control Chiral Imprinting in Perovskite Nanoplatelets". United States. https://doi.org/10.1021/acs.jpcc.2c04192. https://www.osti.gov/servlets/purl/1905454.
@article{osti_1905454,
title = {Ligand Coverage and Exciton Delocalization Control Chiral Imprinting in Perovskite Nanoplatelets},
author = {Georgieva, Zheni N. and Zhang, Zhendian and Zhang, Peng and Bloom, Brian P. and Beratan, David N. and Waldeck, David H.},
abstractNote = {Chiral perovskites have generated significant recent interest, yet little is known about how their chiro-optical properties arise. In this study, chiral methylammonium lead halide perovskite nanoplatelets (NPLs) with varied halide and ligand compositions are prepared using direct synthetic methods. Circular dichroism (CD) and 1H NMR studies find a non-linear relationship between the chiroptical properties and the ratio of chiral phenylethylammonium (PEA) to achiral octylamine (OA) ligands on the NPL surface. We use density functional theory (DFT) computations and a chiral imprinted particle-in-a-box model to rationalize the experimentally observed CD spectra and find that the saturation point of the induced chirality depends on the size of the perovskite exciton relative to the size of the ligands. Temperature-dependent CD and 1H NMR studies, combined with DFT analysis, show that both the CD intensity and sign depend strongly on the structure and orientation of the ligands. Furthermore, this work reveals the complex nature of chiral imprinting in perovskite nanostructures and establishes a simple physical model for ligand-induced chiral imprinting to guide the further development of chiral materials.},
doi = {10.1021/acs.jpcc.2c04192},
journal = {Journal of Physical Chemistry. C},
number = 37,
volume = 126,
place = {United States},
year = {Tue Aug 23 00:00:00 EDT 2022},
month = {Tue Aug 23 00:00:00 EDT 2022}
}
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