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首页> 外文期刊>Crystal growth & design >Two-Dimensional van der Waals Epitaxy Kinetics in a Three-Dimensional Perovskite Halide
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Two-Dimensional van der Waals Epitaxy Kinetics in a Three-Dimensional Perovskite Halide

机译：三维钙钛矿卤化物中的二维Van der Waals外延动力学

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摘要

The exploration of emerging materials physics and prospective applications of two-dimensional materials greatly relies on the growth control of their thickness, phases, morphologies, and film substrate interactions. Though substantial progress has been made for the development of two-dimensional films from conventional layered bulky materials, particular challenges remain for obtaining ultrathin, single crystalline, dislocation-free films from intrinsically non-van der Waals-type three-dimensional materials. In this report, with the successful demonstration of single crystalline ultrathin large-scale perovskite halide material, we reveal and identify the favorable role of weak van der Waals film substrate interaction on the nucleation and growth of the two-dimensional morphology out of nonlayered materials compared to conventional epitaxy. We also show how the bonding nature of the three-dimensional material itself affects the kinetic energy landscape of ultrathin film growth. By studying the formation of fractal perovskites assisted with Monte Carlo simulations, we demonstrate that the competition between the van der Waals diffusion and surface free energy of the perovskite leads to film thickening, suggesting that extra strategies such as surface passivation may be needed for the growth of monolayer and few-layer films.
机译：对新兴材料物理学的探索和二维材料的预期应用在很大程度上取决于对它们的厚度，相，形态和薄膜基材相互作用的生长控制。尽管从常规的层状大体积材料开发二维膜已取得实质性进展，但是从本质上非范德华式三维材料获得超薄，单晶，无位错的膜仍面临特殊挑战。在本报告中，通过成功地证明了单晶超薄大型钙钛矿卤化物材料，我们揭示并确定了较薄的范德华薄膜基质相互作用对非层状材料中二维形态的形核和生长的有利作用。常规外延。我们还展示了三维材料本身的粘合性质如何影响超薄膜生长的动能态势。通过在蒙特卡罗模拟的辅助下研究分形钙钛矿的形成，我们证明了范德华扩散与钙钛矿表面自由能之间的竞争导致了膜的增厚，这表明生长可能需要额外的策略，例如表面钝化单层和几层膜。

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