Solubility‐Controlled Room‐Temperature Synthesis of Cesium Lead Halide Perovskite Nanocrystals

Abstract

All-inorganic lead halide perovskite (IHP) nanocrystals (NC) have demonstrated to be a promising active material in a wide range of optoelectronic applications due to their chemical and thermal stability compared to organicinorganic perovskite NCs. However, the synthetic procedure of IHP NC generally requires a high-temperature reaction of the precursors due to their limited solubility. Alternatively, the affinity of the precursor elements to the solvent was controlled to enhance their solubility in the liquid phase, and thus the enhanced kinetics in the crystallization process. Here, we show how the controlled solubility of Cs salts (i. e., Cs halide, acetate, carbonate) influences on their crystallization process and their optical properties. The formation of highly luminescent CsPbX 3 (X=Cl, Br, and mixed Br/Cl and Br/ I) NCs with a well-controlled crystallinity and morphology provide fundamental insights into their crystallization process, broadening their applications in the optoelectronic devices.

Influence of Electrospinning Setup Parameters on Properties of Polymer-Perovskite Nanofibers

“…The intermediate phase is formed as a result of the complexation of the polymer and the perovskite precursors. Prenucleation clusters could emerge around polymeric chains, promoting the nucleation of perovskite at low temperatures [ 32 , 35 , 38 , 39 ]. The intensity of peaks near 14°, 20°, and 29° increases by 2.55%, 2.78%, and 5.39%, respectively.…”

“…Endothermic peaks around 61 °C are attributed to dehydration. Endothermic peaks around 140 °C can indicate several processes, including the direct transition of perovskite from an amorphous to a crystalline phase, reorganization of the intermediate phase formed after electrospinning, and the full evaporation of the solvent (see the thermodynamical event around 140 °C in TGA diagrams) [ 31 , 32 , 33 , 37 , 38 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 ]. It is suggested that these processes occur sequentially.…”

Novel, Green, and Scalable Aqueous Synthesis of Yellow–Green Emitting Cs3Cu2Cl5 Scintillator and its Application in High‐Resolution TFT Panel for X‐Ray Imaging Detector

“…The key to the successful synthesis of Cs 3 Cu 2 Cl 5 can be ascribed to the large solubility of CsCl in H 2 O (S ≈ 197.175 g/100 g) and CuCl in HCl-H 3 PO 2 solution (S ≈ 28.989 g/100 g), whereas that of Cs 3 Cu 2 Cl 5 in the H 2 O-HCl-H 3 PO 2 solution is very small (S ≈ 7.996 g/100 g). According to the kinetic principle, [31][32][33] high concentrations of reactants and low solubility of product helps the reaction equilibrium move towards the product until the reaction reaches equilibrium. Therefore, the yield of Cs 3 Cu 2 Cl 5 prepared by this method is high (77%).…”

Tiny spots to light the future: advances in synthesis, properties, and application of perovskite nanocrystals in solar cells

“…Nevertheless, room-temperature alternatives to the hot injection method have been studied. 126,130,131 For example, a room temperature strategy for synthesizing CsPbBr 3 NC was proposed by using octyl phosphonic acid (OPA) and didodecyldimethylammonium bromide. 126 The first can control the nucleation of the NC, while the last is employed to quench the growth.…”