title: Surface Plasmon-Enhanced Photodetection in Few Layer MoS2 Phototransistors with Au Nanostructure Arrays.
abstract: 2D Molybdenum disulfide (MoS2 ) is a promising candidate material for high-speed and flexible optoelectronic devices, but only with low photoresponsivity. Here, a large enhancement of photocurrent response is obtained by coupling few-layer MoS2 with Au plasmonic nanostructure arrays. Au nanoparticles or nanoplates placed onto few-layer MoS2 surface can enhance the local optical field in the MoS2 layer, due to the localized surface plasmon (LSP) resonance. After depositing 4 nm thick Au nanoparticles sparsely onto few-layer MoS2 phototransistors, a doubled increase in the photocurrent response is observed. The photocurrent of few-layer MoS2 phototransistors exhibits a threefold enhancement with periodic Au nanoarrays. The simulated optical field distribution confirms that light can be trapped and enhanced near the Au nanoplates. These findings offer an avenue for practical applications of high performance MoS2 -based optoelectronic devices or systems in the future.
authors: National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yutian Road, Shanghai, 200083, P.R. China.
authors: Jinshui
authors: J
authors: Miao
authors: National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yutian Road, Shanghai, 200083, P.R. China.
authors: Weida
authors: W
authors: Hu
authors: National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yutian Road, Shanghai, 200083, P.R. China.
authors: Youliang
authors: Y
authors: Jing
authors: National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yutian Road, Shanghai, 200083, P.R. China.
authors: Wenjin
authors: W
authors: Luo
authors: Department of Physics and Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, Wuhan University, Wuhan, 430072, P.R. China.
authors: Lei
authors: L
authors: Liao
authors: Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, State Key Laboratory of Chemo/Biosensing and Chemometrics (CBSC), Hunan University, Changsha, 410082, P.R. China.
authors: Anlian
authors: A
authors: Pan
authors: State Key Laboratory of Surface Physics, Fudan University, Shanghai, 200438, P.R. China.
authors: Shiwei
authors: S
authors: Wu
authors: State Key Laboratory of Surface Physics, Fudan University, Shanghai, 200438, P.R. China.
authors: Jingxin
authors: J
authors: Cheng
authors: National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yutian Road, Shanghai, 200083, P.R. China.
authors: Xiaoshuang
authors: X
authors: Chen
authors: National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yutian Road, Shanghai, 200083, P.R. China.
authors: Wei
authors: W
authors: Lu
keywords: 2D materials; Au nanostructure nanoarrays; MoS2 phototransistors; localized surface plasmon