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Vapor phase growth of two-dimensional PdSe2 nanosheets for high-photoresponsivity near-infrared photodetectors

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Abstract

Palladium diselenide (PdSe2), a stable layered material with pentagonal structure, has attracted extensive interest due to its excellent electrical and optoelectronic performance. Here, we report a reliable process to synthesize PdSe2 via chemical vapor deposition (CVD) method. Through systematic regulation of temperature in the growth process, we can tune the thickness, size, nucleation density and morphology of PdSe2 nanosheets. Field-effect transistors based on PdSe2 nanosheets exhibit n-type behavior and present a high electron mobility of 105 cm2·V−1·s−1. The electrical property of the devices after 6 months keeping in the air show little change, implying outstanding air-stability of PdSe2. In addition, PdSe2 near-infrared photodetector shows a photoresponsivity of 660 A·W−1 under 914 nm laser. These performances are better than those of most CVD-grown 2D materials, making ultrathin PdSe2 a highly qualified candidate material for next-generation optoelectronic applications.

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Acknowledgements

We acknowledge the support from National Natural Science Foundation of China (Nos. 61804050, 51991340, 51991343, and 51872086), the Fundamental Research Funds of the Central Universities (Nos. 531107051078 and 531107051055), the Double First-Class Initiative of Hunan University (No. 531109100004), the Hunan Key Laboratory of Two-Dimensional Materials (No. 2018TP1010), and the Strategic Priority Research Program of Chinese Academy of Science, Grant (No. XDB30000000).

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  1. Hunan Key Laboratory of Two-Dimensional Materials, Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha, 410082, China

    Weiting Xu, Weining Shu, Bo Li & Yuan Liu

  2. Hunan Key Laboratory of Two-Dimensional Materials and State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China

    Weiting Xu, Huifang Ma, Zhengwei Zhang, Jia Li, Bei Zhao, Ruixia Wu, Xiangdong Yang, Hongmei Zhang, Bailing Li, Weining Shu, Zucheng Zhang, Bo Li & Xidong Duan

  3. Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education & Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices, School of Physics and Electronics, Hunan University, Changsha, 410082, China

    Jiayang Jiang & Lei Liao

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  1. Weiting Xu
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Xu, W., Jiang, J., Ma, H. et al. Vapor phase growth of two-dimensional PdSe2 nanosheets for high-photoresponsivity near-infrared photodetectors. Nano Res. 13, 2091–2097 (2020). https://doi.org/10.1007/s12274-020-2815-8

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