Opposite Polarity Surface Photovoltage of MoS2 Monolayers on Au Nanodot versus Nanohole Arrays
- 주제(키워드) MoS2 , localized surface plasmon , surface plasmon polariton , photoluminescence , surface photovoltage
- 주제(기타) Nanoscience & Nanotechnology
- 주제(기타) Materials Science, Multidisciplinary
- 설명문(일반) [Song, Jungeun; Kwon, Soyeong; Kim, Bora; Lee, Sang Wook; Kim, Dong-Wook] Ewha Womans Univ, Dept Phys, Seoul 03760, South Korea; [Kim, Eunah; Kim, Ki Kang] Sungkyunkwan Univ, Dept Energy Sci, Suwon 16419, South Korea; [Murthy, Lakshmi N. S.; Hsu, Julia W. P.] Univ Texas Dallas, Dept Mat Sci & Engn, Richardson, TX 75080 USA; [Lee, Taejin; Cho, Chang-Hee] Daegu Gyeongbuk Inst Sci & Technol DGIST, Dept Emerging Mat Sci, Daegu 42988, South Korea; [Hong, Inhae; Lee, Byoung Hoon] Ewha Womans Univ, Div Chem Engn & Mat Sci, Seoul 03760, South Korea; [Choi, Soo Ho; Kim, Ki Kang] Sungkyunkwan Univ, Inst Basic Sci IBS, Ctr Integrated Nanostruct Phys CINAP, Suwon 16419, South Korea
- 등재 SCIE, SCOPUS
- 발행기관 AMER CHEMICAL SOC
- 발행년도 2020
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000175125
- 본문언어 영어
- Published As http://dx.doi.org/10.1021/acsami.0c14563
- PubMed https://pubmed.ncbi.nlm.nih.gov/33048546
초록/요약
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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