AuBr₃ Induces CsPb(Br/I)₃ QDs to Self-Assemble into Nanowires

Perovskite quantum dots can form various forms such as nanowires, nanorods, and nanosheets through self-assembly. Nanoscale self-assembly can be used to fabricate materials with excellent device properties. This study introduces AuBr₃ into CsPb(Br/I)₃ quantum dots, causing them to assemble into nanowires. The nanowires form because part of Au³⁺ is surface-doped to replace Pb²⁺, and the [PbX6]^4- octahedral structure is distorted. The symmetry of the structural surface is broken, and a dipole-moment-induced field is generated, thus promoting self-assembly. Moreover, the presence of Au nanoparticles (NPs) causes a localized surface plasmon resonance and generates strong van der Waals forces that promote self-assembly. Finally, to test other applications of perovskite nanowires, the solution method is used to prepare films by compounding the sample solution and polystyrene (PS) for backlighted displays.