Journal
ADVANCED MATERIALS
Volume 30, Issue 23, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201800097
Keywords
chiral colloidal perovskite nanoplatelets; circular dichroism; quantum confinement
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Funding
- U.S. Department of Energy [ER46430]
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The direct synthesis of chiroptical organic-inorganic methylammonium lead bromide perovskite nanoplatelets that are passivated by R- or S-phenylethylammonium ligands is reported. The circular dichroism spectra can be divided into two components: (1) a region associated with a charge transfer transition between the ligand and the nanoplatelet, 300-350 nm, and (2) a region corresponding to the excitonic absorption maximum of the perovskite, 400-450 nm. The temperature- and concentration-dependent circular dichroism spectra indicate that the chiro-optical response arises from chiral imprinting by the ligand on the electronic states of the quantum-confined perovskite rather than chiral ligand-induced stereoselective aggregation.
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