The Polymer Society of Korea

Abstract

The rational synthesis of one-dimensional (1D) lead-free perovskite nanostructures remains challenging due to complex precursor chemistry that defies classical crystal growth models. Here, we establish and experimentally validate a Complexation-Mediated Diffusion-Limited Growth (CMDLG) framework that integrates coordination chemistry with mass transport kinetics to direct the growth of Cs₃Cu₂I₅ nanowires (NWs). This framework transforms precursor complexation from a synthetic hurdle into a powerful tool for directing anisotropic growth. By engineering the solvent environment to stabilize bulky iodocuprate complexes, we restrict mass transport and introduce a kinetic barrier, complex dissociation, at the growth front, driving the system into a diffusion-limited regime. This enables tunable synthesis of faceted microwires in polar solvents and ultralong, uniform NWs (aspect ratio >10³) in the low-polarity solvent.