Extrinsic Origin of Persistent Photoconductivity in Monolayer MoS2 Field Effect Transistors.
Extrinsic Origin of Persistent Photoconductivity in Monolayer MoS2 Field Effect Transistors.
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DOI：
10.1038/srep11472
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发表时间：
2015-06-26
影响因子：
4.6
通讯作者：
Wang WH
中科院分区：
文献类型：
--
作者：
Wu YC;Liu CH;Chen SY;Shih FY;Ho PH;Chen CW;Liang CT;Wang WH
最近发现的二硫化钼（MoS2）的光响应显示了相当大的潜力，这些二维过渡金属dichalcogenides的光电应用。在MoS2的各种类型的光响应中，已经报道了不同水平的持续光电导（PPC）。然而，尽管PPC效应对材料的光响应具有重要意义，但对MoS2中PPC效应及其机制的详细研究仍然不可用。在这里，我们提出了一个系统的PPC效应在单层二硫化钼的研究，并得出结论，该效果可以归因于随机本地化的设备中的电位波动。值得注意的是，电位波动源自基于PPC的衬底效应的外部源。此外，我们指出了在二硫化钼的PPC效应和二硫化钼的逾渗输运行为之间的相关性。我们展示了一种独特而有效的方法来控制单层MoS2中的PPC效应，这可能会为未来基于MoS2的光电应用提供新的功能。
Recent discoveries of the photoresponse of molybdenum disulfide (MoS2) have shown the considerable potential of these two-dimensional transition metal dichalcogenides for optoelectronic applications. Among the various types of photoresponses of MoS2, persistent photoconductivity (PPC) at different levels has been reported. However, a detailed study of the PPC effect and its mechanism in MoS2 is still not available, despite the importance of this effect on the photoresponse of the material. Here, we present a systematic study of the PPC effect in monolayer MoS2 and conclude that the effect can be attributed to random localized potential fluctuations in the devices. Notably, the potential fluctuations originate from extrinsic sources based on the substrate effect of the PPC. Moreover, we point out a correlation between the PPC effect in MoS2 and the percolation transport behavior of MoS2. We demonstrate a unique and efficient means of controlling the PPC effect in monolayer MoS2, which may offer novel functionalities for MoS2-based optoelectronic applications in the future.