Direct observation of the layer-dependent electronic structure in phosphorene
Direct observation of the layer-dependent electronic structure in phosphorene
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DOI：
10.1038/nnano.2016.171
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发表时间：
2017-01-01
影响因子：
38.3
通讯作者：
Wang, Feng
中科院分区：
文献类型：
--
作者：
Li, Likai;Kim, Jonghwan;Wang, Feng
磷烯是黑磷的单原子层，最近作为一种新的二维（2D）材料出现，有望用于电子和光子技术（1-5）。本文通过实验证明，少层磷烯的电子结构随层数的变化显著，与理论预测一致。带间光学跃迁覆盖了从可见光到中红外的广泛的、技术上重要的光谱范围。此外，我们观察到在能量与吸收边缘紧密匹配的低层磷二烯中有很强的光致发光，表明它们是直接带隙半导体。磷烯强烈的层依赖电子结构，加上其高电迁移率，使其在电子和光电应用方面比其他二维材料具有明显的优势。
Phosphorene, a single atomic layer of black phosphorus, has recently emerged as a new two-dimensional (2D) material that holds promise for electronic and photonic technologies(1-5). Here we experimentally demonstrate that the electronic structure of few-layer phosphorene varies significantly with the number of layers, in good agreement with theoretical predictions. The interband optical transitions cover a wide, technologically important spectral range from the visible to the mid-infrared. In addition, we observe strong photoluminescence in few-layer phosphorene at energies that closely match the absorption edge, indicating that they are direct bandgap semiconductors. The strongly layer-dependent electronic structure of phosphorene, in combination with its high electrical mobility, gives it distinct advantages over other 2D materials in electronic and opto-electronic applications.