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One-step method to simultaneously synthesize separable Te and GeTe nanosheets

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Abstract

The chemical vapor deposition (CVD) method has been widely used to synthesize high-quality two-dimensional (2D) materials. However, just one type of product can be synthesized by general CVD at one time. Here, we demonstrate a one-step CVD method to simultaneously grow two types of products. Importantly, the products can be completely separated by selecting the deposition region. In detail, the controllable and completely separable growth for α-GeTe and Te nanosheets was realized by using one precursor-GeTe powder through the atmospheric pressure CVD (APCVD) approach. High crystal quality of the as-grown α-GeTe nansosheets and Te nanosheets have been proved by the high-resolution transmission electron microscopy (HRTEM) characterization. Further, the field-effect-transistor (FET) based on α-GeTe nanosheet manifests that the as-grown α-GeTe nanosheet is a degenerate semiconductor due to the intrinsic Ge vacancies. Additionally, Te-based FET devices indicate that the good electrical performance of the as-grown Te nanosheet, such as high mobility of 900 cm2V−1s−1 (at room temperature), high on/off ratio of < 106 (at 77 K), and good air-stability. The developed one-step CVD method shows the huge potentials for high-efficiency and high-quality material growth.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (No. 2018YFA0703700), the National Natural Science Foundation of China (Nos. 91964203 and 61974036), the Strategic Priority Research Program of Chinese Academy of Sciences (No. XDB44000000), and the CAS Key Laboratory of Nanosystem and Hierarchical Fabrication. The authors also gratefully acknowledge the support of Youth Innovation Promotion Association CAS.

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Authors and Affiliations

  1. CAS Center for Excellence in Nanoscience, CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing, 100190, China

    Yuyu Yao, Xueying Zhan, Chuyun Ding, Feng Wang, Yanrong Wang, Jia Yang & Zhenxing Wang

  2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China

    Zhenxing Wang

  3. Sino-Danish College, University of Chinese Academy of Sciences, Beijing, 100049, China

    Yuyu Yao

  4. Department of Physics, Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai, 200090, China

    Chuyun Ding

  5. Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan, 430072, China

    Jun He

  6. Sino-Danish Center for Education and Research, Beijing, 100049, China

    Yuyu Yao

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  1. Yuyu Yao
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Correspondence to Zhenxing Wang.

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Yao, Y., Zhan, X., Ding, C. et al. One-step method to simultaneously synthesize separable Te and GeTe nanosheets. Nano Res. 15, 6736–6742 (2022). https://doi.org/10.1007/s12274-022-4330-6

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