Enhancement of MoTe<sub>2</sub> near-infrared absorption with gold hollow nanorods for photodetection

Jiawen You; Ye Yu; Kai Cai; Dongming Zhou; Haiming Zhu; Renyan Wang; Qingfu Zhang; Hongwei Liu; Yuting Cai; Dong Lu; Jang-Kyo KIM; Lin Gan; Tianyou Zhai; Zhengtang Luo

doi:10.1007/s12274-020-2786-9

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Research Article

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

Jiawen You^¹, Ye Yu^{²^,^†}, Kai Cai^{³^,⁵}, Dongming Zhou^⁴, Haiming Zhu^⁴, Renyan Wang^³, Qingfu Zhang^³, Hongwei Liu^¹, Yuting Cai^¹, Dong Lu^⁶, Jang-Kyo KIM^⁷, Lin Gan^{³^,⁵}(

), Tianyou Zhai^³(

), Zhengtang Luo^¹(

)

1Department 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

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

3State 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

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

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

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

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

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

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Graphical Abstract

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.

Keywords

NIR photodetection LSPR MoTe₂ gold hollow nanorods

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Nano Research

Volume 13 Issue 6,
June 2020

Pages 1636-1643

DOI: 10.1007/s12274-020-2786-9

Cite this article:

You J, Yu Y, Cai K, et al. Enhancement of MoTe₂ near-infrared absorption with gold hollow nanorods for photodetection. Nano Research, 2020, 13(6): 1636-1643. https://doi.org/10.1007/s12274-020-2786-9

Topics:

Energy gap Gold Infrared absorption Infrared devices Light absoption Nanorods Photodetectors

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Received: 19 February 2020

Revised: 30 March 2020

Accepted: 01 April 2020

Published: 11 May 2020

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

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