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

Soyeong Kwon, Min Hee Kwon, Jungeun Song, Eunah Kim, Youngji Kim, Bo Ra Kim, Jerome K. Hyun, Sang Wook Lee, Dong Wook Kim

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

In this work, the surface potential (VS) of exfoliated MoS2 monolayers on Au nanostripe arrays with period of 500 nm was investigated using Kelvin probe force microscopy. The surface morphology showed that the suspended MoS2 region between neighboring Au stripes underwent tensile-strain. In the dark, the VS of the MoS2 region on the Au stripe (VS-Au) was larger than that of the suspended MoS2 region (VS-S). However, under green light illumination, VS-Au became smaller than VS-S. To explain the VS modification, band diagrams have been constructed taking into consideration not only the local strain but also the electronic interaction at the MoS2/Au interface. The results of this work provide a basis for understanding the electrical properties of MoS2-metal contacts and improving the performance of MoS2-based optoelectronic devices.

Original languageEnglish
Article number14434
JournalScientific Reports
Volume9
Issue number1
DOIs
StatePublished - 1 Dec 2019

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