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Previous theoretical calculations show azetidinium has the right radial sizeto form a 3D perovskite with lead halides [1], and has been shown to impart, asthe A-site cation of ABX3 unit, beneficial properties to ferroelectricperovskites [2]. However, there has been very limited research into its use asthe cation in lead halide perovskites to date. In this communication we reportthe synthesis and characterization of azetidinium-based lead mixed halideperovskite colloidal nanocrystals. The mixed halide system is iodine andchlorine unlike other reported nanocrystals in the literature where the halidesystems are either iodine/bromine or bromine/chlorine. UV-visible absorbancedata, complemented with photoluminescence spectroscopy, reveals anindirect-bandgap of about 1.96 eV for our nanocrystals. Structuralcharacterization using TEM shows two distinct interatomic distances (2.98 +/-0.15 Angstroms and 3.43 +/- 0.16 Angstroms) and non-orthogonal lattice angles(approximately 112 degrees) intrinsic to the nanocrystals with a probabletriclinic structure revealed by XRD. The presence of chlorine and iodine withinthe nanocrystals is confirmed by EDS spectroscopy. Finally, light-inducedelectron paramagnetic resonance (LEPR) spectroscopy with PCBM confirms thephotoinduced charge transfer capabilities of the nanocrystals. The formation ofsuch semiconducting lead mixed halide perovskite using azetidinium as thecation suggests a promising subclass of hybrid perovskites holding potentialfor optoelectronic applications such as in solar cells and photodetectors.

Azetidinium as Cation in Lead Mixed Halide Perovskite Nanocrystals of Optoelectronic Quality