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Growth of atomically thin MoS2 flakes on high-κ substrates by chemical vapor deposition

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Abstract

The reduction in size of field-effect transistors (FETs) comprised of 3D semiconductors is confronted with the issues such as short-channel effects, tunneling effects and thermal dissipation. The emergence of transition metal dichalcogenides (TMDCs) atomic layers has opened up unprecedented opportunities for scaling down of the electronics in view of their unique layered-structure and excellent properties. TMDCs grown directly on high-k dielectric substrates are beneficial for fabricating high-performance FETs. Here, we demonstrate the direct growth of atomically thin MoS2 flakes on high-κ dielectric (HfO2) substrates via a chemical vapor deposition process. The morphology and structure of the as-grown materials were systemically investigated by optical microscope, atomic force microscope, Raman spectroscopy, photoluminescence, transmission electron microscope and X-ray photoelectron spectroscopy. The MoS2 flakes are approximately 5–10 µm in size with polycrystalline monolayer structure. The optical properties of the MoS2 flakes are also found to be substrate-dependent due to optical interference. In addition, back-gate FETs based on the as-grown MoS2 were fabricated and their performance was investigated. The results indicate that the n-type FETs show high on/off current ratio of ~ 106 and a carrier mobility of 9.75 cm2 V−1 s−1.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (61471270, 51420105002, 51672193, 51572199).

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Authors and Affiliations

  1. College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, China

    Mei Zhao, Lijie Zhang, Manman Liu, Youqing Dong, Chao Zou, Yue Hu, Keqin Yang, Yun Yang & Shaoming Huang

  2. School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006, China

    Shaoming Huang

  3. Department of Physics, University at Buffalo, State University of New York, Buffalo, NY, 14260, USA

    Hao Zeng

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  1. Mei Zhao
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  2. Lijie Zhang
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  3. Manman Liu
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Correspondence to Youqing Dong or Shaoming Huang.

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Zhao, M., Zhang, L., Liu, M. et al. Growth of atomically thin MoS2 flakes on high-κ substrates by chemical vapor deposition. J Mater Sci 53, 4262–4273 (2018). https://doi.org/10.1007/s10853-017-1820-0

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