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

Abstract

AbstractPerovskite 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.