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Enhancement of MoTe2 near-infrared absorption with gold hollow nanorods for photodetection

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Abstract

Infrared (IR) light photodetection based on two dimensional (2D) materials of proper bandgap has attracted increasing attention. However, the weak IR absorption in 2D materials, due to their ultrathin attribute and indirect bandgap in multilayer structures, degrades their performance when used as IR photodetectors. In this work, we utilize the fact that few-layer MoTe2 flake has a near-IR (NIR) bandgap and demonstrate a ~ 60-fold enhancement of NIR response by introducing a gold hollow nanorods on the surface. Such gold hollow nanorods have distinct absorption peak located also at the NIR regime, therefore induces strong resonance, benefitting NIR absorption in MoTe2, resulting in strong near-field enhancement. With the evidence from steady and transient state optical spectra, we confirm that the enhancement of NIR response originates only photon absorption, rather than electron transport at interfaces as observed in other heterostructures, therefore, precluding the requirement of high-quality interfaces for commercial applications.

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Acknowledgements

This project was supported by the Research Grant Council of Hong Kong SAR (No. 1620441), NSFC-RGC Joint Research Scheme (No. N_HKUST607/17), the Innovation and Technology Commission (No. ITC-CNERC14SC01), the Zhongshan Municipal Bureau of Science & Technology (No. ZSST19EG03) and National Natural Science Foundation of China (NSFC) (Nos. 11825203, 51872100, 21825103, 21501060 and 51727809), National Basic Research Program of China (Nos. 2015CB932600 and 2019kfyRCPY059), and Foundation of Shenzhen Science and Technology Innovation Committee (No. JCYJ20180504170444967). Technical assistance from the Materials Characterization and Preparation Facilities of HKUST, and from Analytical and Testing Center in Huazhong University of Science and Technology are greatly appreciated.

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Author notes

  1. Ye Yu

    Present address: Present address: Institute of Semiconductors and Microsystems, Faculty of Electrical and Computer Engineering, Technische Universität Dresden, Dresden, 01187, Germany

Authors and Affiliations

  1. Department of Chemical and Biological Engineering, William Mong Institute of Nano Science and Technology and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China

    Jiawen You, Hongwei Liu, Yuting Cai & Zhengtang Luo

  2. Leibniz-Institut für Polymerforschung Dresden e. V., Hohe Straße 6, Dresden, 01069, Germany

    Ye Yu

  3. State Key Laboratory of Material Processing and Die and Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China

    Kai Cai, Renyan Wang, Qingfu Zhang, Lin Gan & Tianyou Zhai

  4. Department of Chemistry, Zhejiang University, Hangzhou, 310027, China

    Dongming Zhou & Haiming Zhu

  5. Shenzhen R&D Center of Huazhong University of Science and Technology, Shenzhen, 518000, China

    Kai Cai & Lin Gan

  6. Guangzhou HKUST Fok Ying Tung Research Institute, Guangzhou, 511458, China

    Dong Lu

  7. Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China

    Jang-Kyo Kim

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  1. Jiawen You
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  2. Ye Yu
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Correspondence to Lin Gan, Tianyou Zhai or Zhengtang Luo.

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You, J., Yu, Y., Cai, K. et al. Enhancement of MoTe2 near-infrared absorption with gold hollow nanorods for photodetection. Nano Res. 13, 1636–1643 (2020). https://doi.org/10.1007/s12274-020-2786-9

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  • DOI: https://doi.org/10.1007/s12274-020-2786-9

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