Rational Synthesis of CsPbBr3 Nanorods with Tunable Thickness and Aspect Ratio
Ihor Cherniukh a b, Kseniia Shcherbak a b, Chenglian Zhu a b, Andriy Stelmakh a b, Federica Bertolotti c, Norberto Masciocchi c, Antonietta Guagliardi d, Gabriele Rainò a b, Maryna I. Bodnarchuk b a, Maksym V. Kovalenko a b
a Department of Chemistry and Applied Biosciences, Institute of Inorganic Chemistry, ETH Zürich, Zürich, Switzerland
b Laboratory of Thin Films and Photovoltaics, Empa – Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland, Ueberlandstrasse, 129, Dübendorf, Switzerland
c Department of Science and High Technology and To.Sca.Lab., University of Insubria, Italy
d Istituto di Cristallografia and To.Sca.Lab, Consiglio Nazionale delle Ricerche, Italy
Proceedings of International Conference on Emerging Light Emitting Materials (EMLEM23)
Peyia, Cyprus, 2023 November 13th - 15th
Organizers: Grigorios Itskos, Maksym Kovalenko and Maryna Bodnarchuk
Oral, Ihor Cherniukh, presentation 024
Publication date: 18th August 2023

Lead halide perovskite nanocrystals (NCs) have recently emerged as promising materials for classical and quantum light emission applications thanks to their outstanding optoelectronic properties, such as efficient fluorescence tunable over the entire visible spectral region, minimal inhomogeneous broadening of emission lines, fast radiative decay, high oscillator strength of bright triplet excitons, and long exciton coherence times. While compositional engineering provides an avenue to tuning optical bandgap, NCs shape engineering offers an additional tool for controlling the properties of NCs. It enables, for example, directional emission, spatial confinement of excitons in one or two dimensions, tuning of exciton fine structure and radiative decay. There are many detailed studies on the optoelectronic properties of two-dimensional nanoplatelets with different thicknesses. In order to fill the gap and systematically study shape-dependent properties of one-dimensional perovskite structures, a synthetic approach toward stable, size- and shape-uniform nanorods with tunable thickness and aspect ratio is desired. By exploiting the difference between {110} and {001} facets of the orthorhombic perovskite structure (Pbnm space group), we present a facile synthesis of CsPbBr3 nanorods with tunable size (5-24 nm in thickness) and aspect ratio (1-16, larger for thinner nanorods). The utilization of ligands capable of ensuring sufficient stability will allow a thorough optical characterization of the synthesized nanorods.

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