Spontaneous, Defect-Free Kinking via Capillary Instability during Vapor-Liquid-Solid Nanowire Growth.

摘要: Kinking, a common anomaly in nanowire (NW) vapor–liquid–solid (VLS) growth, represents sudden change of the wire’s axial growth orientation. This study focuses on defect-free kinking during germanium NW VLS after nucleation Ge (111) single crystal substrate, using Au–Ge catalyst liquid droplets defined size. Statistical analysis fraction kinked NWs reveals dependence probability wire diameter and temperature. The morphologies studied by electron microscopy show two distinct, defect-free, modes, whose underlying mechanisms are explained with help 3D multiphase field simulations. Type I kinking, which axis changes from vertical [111] to ⟨110⟩, was observed nominal ∼20 nm. size coincides critical at spontaneous transition ⟨111⟩ ⟨110⟩ occurs phase Larger only exhibit II t...