Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 56, Issue 44, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-6463/acea91
Keywords
MoS2; Au nanoparticles; photodetector; localized surface plasmon resonance
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This article introduces a method for preparing single-layer gold (Au) nanoparticles and applying them to MoS2 photodetectors, achieving high responsivity. This method provides a simple and effective way to fabricate high-performance 2D material-based photodetectors.
Molybdenum disulfide (MoS2) has been considered as a promising candidate material for photodetectors due to its unrivaled transistor behavior and strong light absorption. However, due to the ultra-thin nature of monolayer or few-layer MoS2, it exhibits a low optical cross-section, resulting in a very weak light-matter interaction and accordingly limiting the photoelectric conversion efficiency. In this work, we report a facile method to prepare single-layer gold (Au) nanoparticles with ultra-high area density according to the annealing of thin Au films. By transferring the single-layer Au nanoparticle film onto a prefabricated MoS2 photodetector, we demonstrate a photodetector with a responsivity as high as 1120 A W-1. Moreover, it is found that the response time is not affected by the Au nanoparticle decoration. This method provides an easy but effective way to fabricate high-performance two-dimensional material-based photodetectors.
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