Synthesis and Improved Photoluminescent Properties and Stability of Bromine‐Rich CsPbBr3 Nanocrystals Via using CTAB as Additive

Although CsPbBr3 nanocrystals (NCs) show excellent optoelectronic properties, their stability greatly limits their potential applications due to the ionicity. Stable bromine‐rich CsPbBr3 nanocrystals (NCs) are achieved by the thermal injection method, which includes adding cetyltrimethylammonium bromide (CTAB) to a cesium oleate precursor solution. The CTAB as a ligand provides strong binding to the NC surface to effectively passivate the surface defects, and most importantly helps to realize the formation of bromine‐rich CsPbBr3 NCs. The obtained bromine‐rich CsPbBr3 NCs show higher photoluminescence quantum yields (PLQYs) and enhanced moisture and UV illumination stability. These results provide a simple strategy to synthesize bromine‐rich CsPbBr3 NCs, which can be promising for integrating into the synthesize technique of perovskite optoelectronic devices. This study reports a simple one‐pot fabrication method to prepare CsPbBr3 nanocrystals (NCs) by combining a water bath heating method with surface engineering strategy. CsPbBr3 NCs with high stability and high photoluminescence quantum yield (PLQY) are finally synthesized through the common passivation of perovskite nanocrystals by cetyltrimethylammonium bromide (CTAB) and oleylamine (OLA).