Cited 1 time in webofscience Cited 4 time in scopus

Opposite Polarity Surface Photovoltage of MoS2Monolayers on Au Nanodot versus Nanohole Arrays

Title
Opposite Polarity Surface Photovoltage of MoS2Monolayers on Au Nanodot versus Nanohole Arrays
Authors
Song, JungeunKwon, SoyeongKim, BoraKim, EunahMurthy, Lakshmi N. S.Lee, TaejinHong, InhaeLee, Byoung HoonLee, Sang WookChoi, Soo HoKim, Ki KangCho, Chang-HeeHsu, Julia W. P.Kim, Dong-Wook
DGIST Authors
Cho, Chang-Hee
Issue Date
2020-10
Citation
ACS Applied Materials and Interfaces, 12(43), 48991-48997
Type
Article
Article Type
Article
Author Keywords
MoS2localized surface plasmonsurface plasmon polaritonphotoluminescencesurface photovoltage
Keywords
EMISSIONPHOTOLUMINESCENCERAMANNANOPARTICLES
ISSN
1944-8244
Abstract
We prepared MoS2 monolayers on Au nanodot (ND) and nanohole (NH) arrays. Both these sample arrays exhibited enhanced photoluminescence intensity compared with that of a bare SiO2/Si substrate. The reflectance spectra of MoS2/ND and MoS2/NH had clear features originating from excitation of localized surface plasmon and propagating surface plasmon polaritons. Notably, the surface photovoltages (SPV) of these hybrid plasmonic nanostructures had opposite polarities, indicating negative and positive charging at MoS2/ND and MoS2/NH, respectively. Surface potential maps, obtained by Kelvin probe force microscopy, suggested that the potential gradient led to a distinct spatial distribution of photo-generated charges in these two samples under illumination. Furthermore, the local density of photo-generated excitons, as predicted from optical simulations, explained the SPV spectra of MoS2/ND and MoS2/NH. We show that the geometric configuration of the plasmonic nanostructures modified the polarity of photo-generated excess charges in MoS2. These findings point to a useful means of optimizing optoelectronic characteristics and improving the performance of MoS2-based plasmonic devices. © 2020 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/12624
DOI
10.1021/acsami.0c14563
Publisher
American Chemical Society
Related Researcher
  • Author Cho, Chang-Hee Future Semiconductor Nanophotonics Laboratory
  • Research Interests Semiconductor; Nanophotonics; Light-Matter Interaction
Files:
There are no files associated with this item.
Collection:
Department of Emerging Materials ScienceFuture Semiconductor Nanophotonics Laboratory1. Journal Articles


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