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Research Article

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

Jiawen You1, Ye Yu2,†, Kai Cai3,5, Dongming Zhou4, Haiming Zhu4, Renyan Wang3, Qingfu Zhang3, Hongwei Liu1, Yuting Cai1, Dong Lu6, Jang-Kyo KIM7, Lin Gan3,5(), Tianyou Zhai3(), Zhengtang Luo1()
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
Leibniz-Institut für Polymerforschung Dresden e. V., Hohe Straße 6, Dresden 01069, Germany
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
Department of Chemistry, Zhejiang University, Hangzhou 310027, China
Shenzhen R&D Center of Huazhong University of Science and Technology, Shenzhen 518000, China
Guangzhou HKUST Fok Ying Tung Research Institute, Guangzhou 511458, China
Department 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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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 photodetectionLSPRMoTe2gold 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 gapGoldInfrared absorptionInfrared devices Light absoptionNanorodsPhotodetectors
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