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Condensed Matter > Mesoscale and Nanoscale Physics

arXiv:1505.05234 (cond-mat)
[Submitted on 20 May 2015]

Title:Extrinsic Origin of Persistent Photoconductivity in Monolayer MoS2 Field Effect Transistors

Authors:Yueh-Chun Wu, Cheng-Hua Liu, Shao-Yu Chen, Fu-Yu Shih, Po-Hsun Ho, Chun-Wei Chen, Chi-Te Liang, Wei-Hua Wang
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Abstract: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.
Subjects: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
Cite as: arXiv:1505.05234 [cond-mat.mes-hall]
  (or arXiv:1505.05234v1 [cond-mat.mes-hall] for this version)
  https://doi.org/10.48550/arXiv.1505.05234

Submission history

From: Wei-Hua Wang [view email]
[v1] Wed, 20 May 2015 03:01:28 UTC (1,234 KB)
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