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Vapor-liquid-solid growth of organic/inorganic hybrid perovskite nanowires
신내철 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
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 PbI<sub>2</sub> nanowires using PbI<sub>2</sub> thin film as the substrate layer for homoepitaxy. We confirm that the lattice mismatch of the van der Waals PbI<sub>2</sub> layer plays a critical role in the aligned growth of PbI<sub>2</sub> 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 PbI<sub>2</sub> substrate layer. The vapor phase conversion into MAPbI<sub>3</sub> 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.
Controlling Orientation of VLS-grown Lead Iodide van der Waals Nanowires
허이구,신내철 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Lead iodide (PbI<sub>2</sub>) is widely used as a precursor for the conversion into organic-inorganic hybrid perovskite (OIHP) materials such as CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub>, promising candidates for optoelectronic and energy harvesting applications. Once fabricated in nanostructures, particularly in 1D nanowires, PbI<sub>2</sub> is expected to boost the current properties of OIHP materials (e.g., absorption coefficient and carrier mobility). Here, we show that the orientation of PbI<sub>2</sub> van der Waals nanowires grown by vapor-liquid-solid (VLS) method can be controlled via PbBr<sub>2</sub> introduction. [0001]-oriented, homoepitaxially-grown PbI<sub>2</sub> nanowires are observed to kink in [-12-10] direction upon the addition of trace amount of PbBr<sub>2</sub> during the VLS growth. A kinetic model based on the observation suggests that the kinking is governed by the surface energetics of the triple phase line of Pb catalyst. This study suggests a potential of precursor structure engineering to realize enhanced device performance of OIHP materials.