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In this work, the surface potential ( V  S ) of exfoliated MoS 2  monolayers on Au nanostripe arrays with period of 500 nm was investigated using Kelvin probe force microscopy. The surface morphology showed that the suspended MoS 2  region between neighboring Au stripes underwent tensile-strain. In the dark, the  V  S  of the MoS 2  region on the Au stripe ( V  S -Au) was larger than that of the suspended MoS 2  region ( V  S -S). However, under green light illumination,  V  S -Au became smaller than  V  S -S. To explain the  V  S  modification, band diagrams have been constructed taking into consideration not only the local strain but also the electronic interaction at the MoS 2 /Au interface. The results of this work provide a basis for understanding the electrical properties of MoS 2 -metal contacts and improving the performance of MoS 2 -based optoelectronic devices.

Light-Induced Surface Potential Modification in MoS2 Monolayers on Au Nanostripe Arrays