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Design and construction of ultra-thin MoSe2 nanosheet-based heterojunction for high-speed and low-noise photodetection

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Abstract

Advances in the photocurrent conversion of two-dimensional (2D) transition metal dichalcogenides have enabled the realization and application of ultrasensitive and broad-spectral photodetectors. The requirements of previous devices constantly drive for complex technological implementation, resulting in limits in scale and complexity. Furthermore, the development of large-area and low-cost photodetectors would be beneficial for applications. Therefore, we demonstrate a novel design of a heterojunction photodetector based on solution-processed ultrathin MoSe2 nanosheets to satisfy the requirements of its application. The photodetector exhibits a high sensitivity to visible–near infrared light, with a linear dynamic range over 124 decibels (dB), a detectivity of ~1.2 × 1012 Jones, and noise current approaching 0.1 pA·Hz–1/2 at zero bias. Significantly, the device shows an ultra-high response speed up to 30 ns with a 3-dB predicted bandwidth over 32 MHz, which is far better than that of most of the 2D nanostructured and solution-processable photodetectors reported thus far and is comparable to that of commercial Si photodetectors. Combining our results with material-preparation methods, together with the methodology of device fabrication presented herein, can provide a pathway for the large-area integration of low-cost, high-speed photodetectors.

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Authors and Affiliations

  1. School of Electrical Science and Applied Physics, Hefei University of Technology, Hefei, 230009, China

    Xiangshun Geng, Yongqiang Yu, Kewei Xu, Chunyan Wu & Li Wang

  2. Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemistry, Laboratory of Nanomaterials for Energy Conversion and Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China (USTC), Hefei, 230026, China

    Yongqiang Yu, Xiaoli Zhou, Chunde Wang & Qing Yang

  3. School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China

    Yan Zhang & Yang Jiang

Authors
  1. Xiangshun Geng
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  2. Yongqiang Yu
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  3. Xiaoli Zhou
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  4. Chunde Wang
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  5. Kewei Xu
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  6. Yan Zhang
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  7. Chunyan Wu
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  8. Li Wang
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  9. Yang Jiang
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  10. Qing Yang
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Correspondence to Yongqiang Yu, Yang Jiang or Qing Yang.

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These authors contributed equally to this work.

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Geng, X., Yu, Y., Zhou, X. et al. Design and construction of ultra-thin MoSe2 nanosheet-based heterojunction for high-speed and low-noise photodetection. Nano Res. 9, 2641–2651 (2016). https://doi.org/10.1007/s12274-016-1151-5

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  • DOI: https://doi.org/10.1007/s12274-016-1151-5

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