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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.