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Opposite Polarity Surface Photovoltage of MoS2 Monolayers on Au Nanodot versus Nanohole Arrays

Title
Opposite Polarity Surface Photovoltage of MoS2 Monolayers 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
Ewha Authors
김동욱이상욱이병훈
SCOPUS Author ID
김동욱scopus; 이상욱scopus; 이병훈scopus
Issue Date
2020
Journal Title
ACS APPLIED MATERIALS & INTERFACES
ISSN
1944-8244JCR Link

1944-8252JCR Link
Citation
ACS APPLIED MATERIALS & INTERFACES vol. 12, no. 43, pp. 48991 - 48997
Keywords
MoS2localized surface plasmonsurface plasmon polaritonphotoluminescencesurface photovoltage
Publisher
AMER CHEMICAL SOC
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
We prepared MoS2 monolayers on Au nanodot (ND) and nanohole (NH) arrays. Both these sample arrays exhibited enhanced photo-luminescence 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.
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DOI
10.1021/acsami.0c14563
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자연과학대학 > 물리학전공 > Journal papers
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