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Negative photoconductivity observed in polycrystalline monolayer molybdenum disulfide prepared by chemical vapor deposition

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Abstract

In this paper, the negative photoconductivity (NPC) was observed in molybdenum disulfide (MoS2) prepared by chemical vapor deposition. The conductivity drops by 15% in stable light excitation. We speculate that the generation of NPC is due to the electronic transition to the defect state level, which reduces the rate of movement of non-equilibrium carrier. In the low-defect system, free excitons predominate, and the material exhibits positive photoconductivity. It is beneficial to the research on a new single-wavelength photodetector based on NPC.

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Acknowledgements

This work was financially supported by the Scientific Research Found of Hunan Provincial Education Department (no. 17K086).

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Authors and Affiliations

  1. Hunan Provincial Key Laboratory of Micro-Nano Energy Materials and Devices and Faculty of Physics and Optoelectronic Engineering, Xiangtan University, Hunan, 411105, People’s Republic of China

    Xuling Xiao, Jun Li, Jie Wu, Donglin Lu & Chao Tang

  2. Laboratory for Quantum Engineering and Micro-Nano Energy Technology, Xiangtan University, Hunan, 411105, People’s Republic of China

    Xuling Xiao, Jun Li, Jie Wu, Donglin Lu & Chao Tang

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  1. Xuling Xiao
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  2. Jun Li
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  3. Jie Wu
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Correspondence to Jun Li or Chao Tang.

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Xiao, X., Li, J., Wu, J. et al. Negative photoconductivity observed in polycrystalline monolayer molybdenum disulfide prepared by chemical vapor deposition. Appl. Phys. A 125, 765 (2019). https://doi.org/10.1007/s00339-019-3054-2

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