| 초록 |
Lead halide-based perovskite (LHP) nanowires are promising material system for various electronic, optoelectronic applications. Controlling their structures including crystal orientation, morphology, etc. is crucial to leverage the excellent physical properties. In this talk, we show the vapor-liquid-solid (VLS) growth of orientation-controlled PbI2 nanowires using PbI2 thin film as the substrate layer for homoepitaxy. We confirm that the lattice mismatch of the van der Waals PbI2 layer plays a critical role in the aligned growth of PbI2 nanowires. A layer growth model is proposed to suggest that the nanowire growth is stabilized by maintaining the {0001} liquid-solid interface, which stems from the nucleation on the PbI2 substrate layer. The vapor phase conversion into MAPbI3 depends on the transfer process of the as-grown nanowires and their conversion time. These findings provide a general route to design and fabricate LHP nanostructures for a variety of future applications. |
