Solution-Phase Synthesis of CsPbI3 Nanowire Clusters via Polymer-Induced Anisotropic Growth and Self-Assembly

A facile solution-phase synthesis of black γ-phase CsPbI3 nanowire clusters were developed by using poly (methyl methacrylate) (PMMA) as surfactant. PMMA was found to efficiently retard the crystal growth, thereby inducing anisotropic growth for the formation of nanowire structure, whilst the intermolecular hydrogen bonds of PMMA act a driving force for the self-assembly of nanowires. The various geometric parameter and crystal structures of perovskite nanocrystals can be fabricated in a controlled way by adjusting the concentration of PMMA and reaction temperature.