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

doi:10.1038/s41598-019-50950-2

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 journal › Article › peer-review

17 Scopus citations

Abstract

In this work, the surface potential (V_S) 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 V_S of the MoS₂ region on the Au stripe (V_S-Au) was larger than that of the suspended MoS₂ 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 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 language	English
Article number	14434
Journal	Scientific Reports
Volume	9
Issue number	1
DOIs	https://doi.org/10.1038/s41598-019-50950-2
State	Published - 1 Dec 2019

Bibliographical note

Publisher Copyright:
© 2019, The Author(s).

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10.1038/s41598-019-50950-2

Cite this

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title = "Light-Induced Surface Potential Modification in MoS2 Monolayers on Au Nanostripe Arrays",

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.",

author = "Soyeong Kwon and Kwon, {Min Hee} and Jungeun Song and Eunah Kim and Youngji Kim and Kim, {Bo Ra} and Hyun, {Jerome K.} and Lee, {Sang Wook} and Kim, {Dong Wook}",

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AU - Kwon, Soyeong

AU - Kwon, Min Hee

AU - Song, Jungeun

AU - Kim, Eunah

AU - Kim, Youngji

AU - Kim, Bo Ra

AU - Hyun, Jerome K.

AU - Lee, Sang Wook

AU - Kim, Dong Wook

PY - 2019/12/1

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