Periodic Arrays of Phosphorene Nanopores as Antidot Lattices with Tunable Properties.
Periodic Arrays of Phosphorene Nanopores as Antidot Lattices with Tunable Properties.
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DOI：
10.1021/acsnano.7b04031
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发表时间：
2017-07-25
期刊：
影响因子：
17.1
通讯作者：
Meunier V
中科院分区：
文献类型：
--
作者：
Cupo A;Masih Das P;Chien CC;Danda G;Kharche N;Tristant D;Drndić M;Meunier V
磷烯的可调带隙扩展了其在纳米电子和光电应用中的适用性。在这里，我们建议调整磷烯的带隙图案antidot晶格，这是周期性阵列的孔或nanopores蚀刻在材料中，并利用量子限制在相应的nanoconstrictions。我们制作的antidot晶格的半径下降到13 nm的几层黑磷片的氧化物层的保护和观察抑制面内声子模式相对于未改性的材料通过拉曼光谱。与石墨烯反点相反，少层BP反点中的拉曼峰位置没有变化，与预测的功率谱一致。我们还使用DFT计算来预测磷烯反点晶格的电子性质，并观察到与量子限制效应一致的带隙缩放。偏差主要归因于自钝化边缘形态，其中每个磷原子具有与原始材料相同的每个原子的键数，使得没有掺杂剂可以饱和悬挂键。与扶手椅边缘相比，空穴之间的锯齿形边缘纳米收缩的量子限制更强，导致大致双峰带隙分布。有趣的是，在两个antidot结构中，一个未报道的锯齿形边缘的自钝化重建赋予系统金属成分。反量子点的实验证明和理论结果提供了进一步缩小反量子点在几纳米尺寸范围内的纳米级的动力，其中量子限制是特别重要的。
A tunable band gap in phosphorene extends its applicability in nanoelectronic and optoelectronic applications. Here, we propose to tune the band gap in phosphorene by patterning antidot lattices, which are periodic arrays of holes or nanopores etched in the material, and by exploiting quantum confinement in the corresponding nanoconstrictions. We fabricated antidot lattices with radii down to 13 nm in few-layer black phosphorus flakes protected by an oxide layer and observed suppression of the in-plane phonon modes relative to the unmodified material via Raman spectroscopy. In contrast to graphene antidots, the Raman peak positions in few-layer BP antidots are unchanged, in agreement with predicted power spectra. We also use DFT calculations to predict the electronic properties of phosphorene antidot lattices and observe a band gap scaling consistent with quantum confinement effects. Deviations are attributed primarily to self-passivating edge morphologies, where each phosphorus atom has the same number of bonds per atom as the pristine material so that no dopants can saturate dangling bonds. Quantum confinement is stronger for the zigzag edge nanoconstrictions between the holes as compared to those with armchair edges, resulting in a roughly bimodal band gap distribution. Interestingly, in two of the antidot structures an unreported self-passivating reconstruction of the zigzag edge endows the systems with a metallic component. The experimental demonstration of antidots and the theoretical results provide motivation to further scale down nanofabrication of antidots in the few-nanometer size regime, where quantum confinement is particularly important.
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影响因子：
41.2
作者：
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