Hot-Injection Synthesis Protocol for Green-Emitting Cesium Lead Bromide Perovskite Nanocrystals

Abstract

All-inorganic cesium lead bromide (CsPbBr 3 ) nanocrystals are one of the prominent members of the metal halide perovskite family of semiconductor materials, which possess considerable stability and excellent optoelectronic properties leading to a multitude of their potential applications in solar cells, light-emitting devices, photodetectors, and lasers. Hot-injection strategy is a popular method used to synthesize CsPbBr 3 nanocrystals, which provides a convenient route to produce them in the shape of rather monodisperse nanocubes. As in any synthetic procedure, there are different factors like temperature, surface ligands, precursor concentration, as well as necessary postpreparation purification steps. Herein, we provide a comprehensive hot-injection synthesis protocol for CsPbBr 3 nanocrystals, outlining intrinsic and extrinsic factors that affect its reproducibility and elucidating in detail the precursor solution preparation, nanocrystal formation and growth, and postpreparative purification and storage conditions to allow for the fabrication of high-quality green-emitting material.

Mixed Ligand Passivation as the Origin of Near-Unity Emission Quantum Yields in CsPbBr3 Nanocrystals

“…1 H NMR and DOSY measurements suggest a structural model for the CsPbBr 3 NC surface, summarized in Figure a. Tightly bound DDDMA + occupies interstices between neighboring PbBr 6 octahedra (referred to as PbBr 6 interstices in what follows). ,, Loosely bound *DDDMA + coordinates weakly with the NC surface, likely interacting with apical Br – of terminal PbBr 6 octahedra via ammonium-Br hydrogen bonding and electrostatic interactions. ,− DDDMA + and *DDDMA + nominally exchange positions.…”

Ytterbium-Doped Lead–Halide Perovskite Nanocrystals: Synthesis, Near-Infrared Emission, and Open-Source Machine Learning Model for Prediction of Optical Properties

“…Among the disadvantages of this method is the necessity of using rather high temperatures, the difficulty of scaling up, as well as strong sensitivity of the properties of the resulting product on synthetic deviations [ 37 ]. Recent protocol [ 38 ] has summarized all the details of the hot-injection method for green-emitting CsPbBr 3 pNCs. Another single-step method to produce doped pNCs is the LARP method [ 39 ].…”

Ultrastable CsPbBr3@CsPb2Br5@TiO2 Composites for Photocatalytic and White Light-Emitting Diodes

“…Cesium halide lead perovskite (CsPbX 3 (X = Cl, Br, I)) quantum dots (QDs) have great potential in photovoltaics due to their harmonizable band gap and high photon-to-electron conversion efficiency. − Among them, the excellent light absorption and charge transfer properties have attracted much attention in fields of solar cells and photocatalysis, − and the high photoluminescence quantum yield (PLQY) was considered as one of the most promising materials for display and illumination. − However, the excellent optoelectronic characteristics of CsPbX 3 QDs are often overshadowed by disadvantages associated with their instability. − Therefore, a great deal of work has been devoted to improving the stability of perovskite CsPbX 3 QDs. There were three main directions: (1) construction of core–shell structures, (2) modification of surfaces using ligands, and (3) packaging by polymers.…”