Proximity-Induced Colossal Conductivity Modulation in Phosphorene
Proximity-Induced Colossal Conductivity Modulation in Phosphorene
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DOI：
10.1103/physrevapplied.11.024056
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发表时间：
2019-02-22
影响因子：
4.6
通讯作者：
Ray, S. J.
中科院分区：
文献类型：
--
作者：
Chaudhury, A.;Majumder, S.;Ray, S. J.
磷烯是一种很有前途的单元素二维层状半导体，在未来的纳米电子学和自旋电子学应用中具有巨大的潜力。在这项工作中，我们研究了有机分子（苯）在磷烯纳米带附近的影响。我们广泛的计算表明，由于分子吸附，磷烯的半导体性质不受影响，而运输性质却发生了巨大的变化。在掺杂原子和外部应变的影响下，观察到电导率发生了巨大的变化，最大增强了> 1500%。这种效应对(i)系统尺寸的变化，（ii）掺杂剂的类型、位置和浓度，以及（iii）外部应变的性质和大小都相当稳健。此外，我们演示了如何使用栅极电压来微调场效应晶体管（FET）结构中增强的电导率响应。我们的研究结果为基于磷粉的纳米电子学在传感、开关等应用中提供了方向，在这些应用中，更高的传导水平可以提供更好的分辨率、更高的开关比和更高的能量效率。
Phosphorene is a promising single-elemental two-dimensional layered semiconductor with huge potential for future nanoelectronics and spintronics applications. In this work, we investigate the effect of an organic molecule (benzene) in the close proximity of a phosphorene nanoribbon. Our extensive calculations reveal that the semiconducting nature of phosphorene remains unaffected as a result of the molecular adsorption while the transport properties go through drastic changes. Under the influence of dopant atoms and external strain, colossal changes in the conductivity are observed, with a maximum enhancement > 1500%. This effect is pretty robust against (i) variation of the system size, (ii) the type, location, and concentration of dopants and (iii) the nature and magnitude of the external strain. Furthermore, we demonstrated how a gate voltage can be used to fine tune the enhanced conductivity response in a field-effect transistor (FET) structure. Our results provide direction for phosphorene-based nanoelectronics in applications such as sensing, switching where a higher level of conduction can offer better resolution, a higher on: off ratio, and superior energy efficiency.