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.
Highlights
Zero-dimensional Perovskite Magic-size Clusters play crucial roles in understanding and controlling nucleation and growth of semiconductor nanoparticles
This study suggests that the obtained C H3NH3PbBr3 Perovskite MSCs (PMSCs)/SiO2 with good stability is preferable as a good model, representing actual morphological and structural PMSCs to study both of PMSCs and PQDs structural and formation mechanism through a reliable characterization
C H3NH3PbBr3 PMSCs was synthesized by utilising of an excess concentration of capping ligands i.e., oleylamine and oleic acid and S iO2 addition through a ligand assisted re-precipitation method
Summary
Zero-dimensional Perovskite Magic-size Clusters play crucial roles in understanding and controlling nucleation and growth of semiconductor nanoparticles Their metastability behavior is a critical hindrance for reliable characterizations. The conclusive mechanism of this interaction is a long, hard struggle to be solved owing to their complex interactions and a serious complication in characterization It remains unclear whether the surface ligands are passivating the existing trap states or developing new ones inducing a severely PL quenching. Another strategic approach for synthesized the PMSCs with good long-term stability for reliable characterization should be considered. To the best of our knowledge, there has been no study reported on the SiO2 interaction with PMSCs with enhanced PL stability
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