Enhanced photodetection properties of CVD-grown MOS2 nanosheets onto Ag-nanoparticles decorated substrates

Coupling two-dimensional (2D)-MoS2 nanostructures with metal nanoparticles (NPs) can lead to unprecedented behaviors because of the coupling between the excitons in Mos2and the plasmons of the metal NPs. Here, we report the chemical vapor deposition (CVD) growth of vertical 2D-MoS2 nanosheets onto quartz substrates pre-decorated by Ag-NPs. The Ag-NPs were first deposited by pulsed laser deposition (PLD) and used as a catalyst in order to gain more control on the morphology of Mos2.By depositing Mos2on the PLD-deposited Ag-NPs, we found that the morphology of the CVD grown Mos2changes from planar to vertical 2D- nanosheets. Moreover, the Ag- NPs were also shown to favor the growth of high-quality 2H-MoS2 phase. Our preliminary results show that the light absorption of these novel Ag-NPs/MoS2 composite films can be enhanced over the entire visible spectrum, leading thereby to an improvement of their specific detectivity (D*) by as high as 516%. This work paves the way towards to design and develop highly responsive optoelectronic devices based on the optimized combination of metal-NPs and 2D-MoS2 nanostructures.