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

• Published in: Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2021-09, Vol.9 (34), p.11349-11357
• Main Authors: He, Haiyang, Mei, Shiliang, Chen, Zhihao, Liu, Siyu, Wen, Zhuoqi, Cui, Zhongjie, Yang, Dan, Zhang, Wanlu, Xie, Fengxian, Yang, Bobo, Guo, Ruiqian, Xing, Guichuan
• Format: Article
• ISSN: 2050-7526; 2050-7534
• DOI: 10.1039/d1tc02118d

Cesium lead halide perovskite nanocrystals (NCs) have compelling photoelectric properties while their poor stability severely impedes their practical applications. Herein, we demonstrate novel CsPbBr 3 -CsPbBr 3 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 S 2− ligands, resulting in two different growth rates of CsPbBr 3 NCs and finally forming CsPbBr 3 -CsPbBr 3 homostructured NCs. The performed structural and compositional characterizations corroborate the existence of CsPbBr 3 -CsPbBr 3 homostructured NCs. The obtained CsPbBr 3 -CsPbBr 3 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. Novel CsPbBr 3 -CsPbBr 3 homostructured NCs with enhanced stability have been achieved by a thioacetamide-oleylamine (TAA-OAm) ligand system.