Thioacetamide-ligand-mediated synthesis of CsPbBr3-CsPbBr3 homostructured nanocrystals with enhanced stability

Cesium lead halide perovskite nanocrystals (NCs) have compelling photoelectric properties while their poor stability severely impedes their practical applications. Herein, we demonstrate novel CsPbBr3-CsPbBr3 homostructured NCs induced by a thioacetamide-oleylamine (TAA-OAm) ligand system via a facile room temperature re-precipitation method. The TAA-OAm ligand system could form long-chain N-substituted thioamides and short-chain S2- ligands, resulting in two different growth rates of CsPbBr3 NCs and finally forming CsPbBr3-CsPbBr3 homostructured NCs. The performed structural and compositional characterizations corroborate the existence of CsPbBr3-CsPbBr3 homostructured NCs. The obtained CsPbBr3-CsPbBr3 homostructures exhibit green emission of 510 nm and superior stability at room temperature in air. Our study provides a new approach to improve the stability of halide perovskite NCs, which may pave the way for future optoelectronic applications.

Automated summary

Novel homostructured CsPbBr3-CsPbBr3 nanocrystals with superior stability and green emission were successfully synthesized via a thioacetamide-oleylamine ligand system, offering a promising approach to enhance the stability of halide perovskite nanocrystals for future optoelectronic applications.