National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yutian Road, Shanghai, 200083, P.R. China.
Department of Physics and Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, Wuhan University, Wuhan, 430072, P.R. China.
Small. 2015 May;11(20):2392-8. doi: 10.1002/smll.201403422. Epub 2015 Jan 28.
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.
二维二硫化钼（MoS2）是一种很有前途的高速、灵活的光电设备材料，但光响应率却很低。在这里，通过将少层 MoS2 与 Au 等离子体纳米结构阵列耦合，可以获得光电流响应的大幅增强。放置在少层 MoS2 表面的 Au 纳米颗粒或纳米板可以由于局域表面等离子体（LSP）共振而增强 MoS2 层中的局部光场。在将 4nm 厚的 Au 纳米颗粒稀疏地沉积在少层 MoS2 光电晶体管上之后，观察到光电流响应增加了一倍。周期性 Au 纳米阵列使少层 MoS2 光电晶体管的光电流增强了三倍。模拟的光场分布证实，光可以在 Au 纳米板附近被捕获和增强。这些发现为未来高性能 MoS2 基光电设备或系统的实际应用提供了途径。
