Synergetic effect of the surface ligand and SiO2 driven photoluminescence stabilization of the CH3NH3PbBr3 perovskite magic-sized clusters

Abstract

Zero-dimensional Perovskite Magic-size Clusters play crucial roles in understanding and controlling nucleation and growth of semiconductor nanoparticles. However, their metastability behavior is a critical hindrance for reliable characterizations. Here, we report the first demonstration of using an excess amount of surface ligand and SiO2 as novel passivation for synthesizing the magic-sized clusters (MSCs) by the Ligand-assisted reprecipitation method. A synergetic effect between an excessed surface ligand and SiO2 inhibits the protonation and deprotonation reaction between amine-based and acid-based ligand, leading to enhanced PL stability. The obtained CH3NH3PbBr3 PMSCs/SiO2 retain 70% of its initial emission intensity in ambient conditions for 20 days. This passivation approach opens an entirely new avenue for the reliable characterizations of CH3NH3PbBr3 PMSCs, which will significantly broaden their application for understanding and controlling nucleation and growth of semiconductor nanoparticles.

Revealing the synergetic interaction between amino and carbonyl functional groups and their effect on the electronic and optical properties of carbon dots

“…7a). 56 The UV-Vis absorption of amino CDs-CO shows that increasing the N/O atomic ratio from 0.3 to 0.5 shifts the absorption peak from 550 to 650 nm (Fig. 7b), in line with the computational results.…”

Structural Study of Paraffin-Stabilized Methylammonium Lead Bromide Magic-Sized Clusters

“…Additionally, LARP MSCs are synthesized with 667% more capping ligands than the HLARP synthesis. Since oleic acid and oleylamine were used as stabilizing ligands and they readily react with each other, this may result in the reaction of bound and unbound ligands, causing the detachment of bound ligands, and resulting in aggregation of the nanoparticles . Second, oleylamine can react with water to form oleyl ammonium salt, which reacts and causes a moisture-induced structural degradation .…”

“…There are two potential mechanisms. Since there are both free acid and amine ligands present in the solution, they have the ability to react with ligands bound on the surface of the MSC, leading to aggregation . Furthermore, oleylamine has been shown to react strongly with water and provide a mechanism for moisture-driven structural degradation (Figure ).…”

Tuning between Methylammonium Lead Bromide Perovskite Magic-Sized Clusters and Quantum Dots through Ligand Assisted Reprecipitation at Elevated Temperatures

“…28,29 However, for MSCs, other variables have barely been explored and little research has been done using temperature for tuning. 30 In the Gibbs−Thomson equation, the temperature and critical radius are inversely proportional. Thus, increasing the temperature results in smaller nanoparticles by imparting more energy to the surface, allowing them to stabilize at smaller sizes.…”

“…By varying the temperature, quantum dots have been synthesized using the hot injection method . This requires high temperatures (120–140 °C) and is typically performed in an air-free environment, heating both precursor and antisolvent solutions, but typically results in an increase of monodispersity and particle stability. , However, for MSCs, other variables have barely been explored and little research has been done using temperature for tuning . In the Gibbs–Thomson equation, the temperature and critical radius are inversely proportional.…”