具有类石墨烯蜂窝状结构的蓝磷（BlueP）是黑磷的同素异形体，因其高的载流子迁移率和合适的带隙而被认为是一种具有巨大应用前景的二维（2D）材料。受石墨烯在过渡金属台阶边缘高效成核的启发，选择 Ag 和 Au 金属台阶研究磷团簇的形成。研究发现，Ag台阶是适合生长BlueP 单层的衬底，Au台阶上更倾向于生长 BlueP-Au 合金结构。台阶边缘的金原子比平台中的金原子更容易解离而成为 BlueP-Au 合金结构的构建单元。此外，吸附在台阶边缘的磷团簇通过刻蚀效应能够显著加速金属原子的解离过程。该研究结果为具有理想性能的二维材料的生长提供思路。
As an allotrope of black phosphorus, blue phosphorus (BlueP) with a graphene-like honeycomb structure has been considered as a two-dimensional (2D) material with great potential for various application prospects, which is attributed to its high carrier mobility and suitable band gap. Inspired by the fact that graphene can be nucleated at the transition metal step edge with high efficiency, the steps of Ag and Au are selected to study the formation of P clusters. Ag step is found as the suitable substrate to grow BlueP monolayer and BlueP-Au alloy is prefer to grow on Au step substrate. Au atoms at step edge are much easier to dissociate than those in terrace, which serve as the building block of BlueP-Au alloy network. The dissociation can be significantly accelerated with the etching effect of adsorbed P clusters on the step. The results in this paper could provide insights into the growth of the two-dimensional materials with desirable properties.
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