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Analysis of Physical and Electrical Properties of NiTe2 Single Crystal Grown via Molten Salt Flux Method

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Abstract

Since the emergence of layered two-dimensional materials, the development of methods for their large-scale synthesis has become crucial for integrating these materials into existing fabrication processes. In this study, we report the synthesis of a NiTe2 single crystal on the near-centimeter scale using the molten salt flux method (MSFM). The single-crystal nature of the synthesized NiTe2 sample was confirmed using X-ray diffraction analysis, while its chemical characteristics were analyzed using X-ray photoelectron spectroscopy, which confirmed Ni–Te chemical binding. The layered structure of the ingot was confirmed using Raman spectroscopy; two prominent signals were observed, at 84 and 138 cm−1, which were consistent with the in-plane vibrational mode, Eg, and out-of-plane vibrational mode, A1g. In addition, analyses performed on different flakes confirmed the structural uniformity of the single crystal, as only a small variation in the peak-to-peak position of the full width at half maximum was observed. Using Kelvin probe force microscopy, the electronic structure of the NiTe2 multilayered surface was investigated to determine its surface work function, which was found to be 4.4–4.8 eV. A back-gate field-effect transistor was fabricated using the single-crystal NiTe2 to evaluate its semimetallic characteristics; the transfer characteristic of the NiTe2 FET, determined by applying a back-gate bias, showed weak gate voltage dependence and linear I–V characteristics, in keeping with the linear ID-VD output characteristics. Therefore, the synthesis of NiTe2 via the MSFM should facilitate the integration of layered materials with existing fabrication processes for the mass production of electronic devices.

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Acknowledgements

This work was supported by grants from the National Research Foundation of Korea (NRF) (Nos. 2020R1A4A4079397 and 2021R1C1C1012209), which is funded by the Korean government (MSIT). This work was also supported by a research grant from the Gyeongsang National University in 2022.

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  1. Yeonjin Je and Eunjeong Kim have contributed equally to this work.

Authors and Affiliations

  1. School of Materials Science and Engineering, Gyeongsang National University, Jinju, 52828, South Korea

    Yeonjin Je, Su-yeon Cho & Jun Hong Park

  2. Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju, 52828, South Korea

    Eunjeong Kim, Hyeongtae Kim, Do-Hyeon Lee, Mi Ji Kwon, Younki Lee & Jun Hong Park

  3. Lawrence Livermore National Laboratory, Livermore, CA, USA

    Eunjeong Kim

  4. Electronic Convergence Materials Center, Korea Institute of Ceramic Engineering and Technology, Jinju, 52851, South Korea

    Nguyen Vu Binh, Woo Hyun Nam & Jung Young Cho

  5. Nano Convergence Materials Center, Korea Institute of Ceramic Engineering and Technology, Jinju, 52851, South Korea

    Moonhee Choi

  6. Department of Materials Science and Engineering & Department of Energy Systems Research, Ajou University, Suwon, 16499, Republic of Korea

    Jae Hyun Lee

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  1. Yeonjin Je
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Correspondence to Younki Lee, Jung Young Cho or Jun Hong Park.

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Je, Y., Kim, E., Binh, N.V. et al. Analysis of Physical and Electrical Properties of NiTe2 Single Crystal Grown via Molten Salt Flux Method. Electron. Mater. Lett. 19, 452–461 (2023). https://doi.org/10.1007/s13391-023-00419-2

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