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Energy and charge transfer effects in two-dimensional van der Waals hybrid nanostructures on periodic gold nanopost array

Authors
Kim, Jun YoungKim, Sun GyuYoun, Jong WonLee, YongjunKim, JeongyongJoo, Jinsoo
Issue Date
7-5월-2018
Publisher
AMER INST PHYSICS
Citation
APPLIED PHYSICS LETTERS, v.112, no.19
Indexed
SCIE
SCOPUS
Journal Title
APPLIED PHYSICS LETTERS
Volume
112
Number
19
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/75566
DOI
10.1063/1.5023997
ISSN
0003-6951
Abstract
Two-dimensional (2D) semiconducting MoS2 and WSe2 flakes grown by chemical vapor deposition were mechanically hybridized. A hexagonal boron nitride (h-BN) dielectric flake was inserted between MoS2 and WSe2 flakes to investigate the nanoscale optical properties of 2D van der Waals hybrid nanostructures. The fabricated MoS2/WSe2 and MoS2/h-BN/WSe2 van der Waals hybrid nanostructures were loaded on a periodic gold nanopost (Au-NPo) array to study energy and charge transfer effects at the surface plasmon resonance (SPR) condition. Nanoscale photoluminescence (PL) spectra of the 2D hybrid nanostructures were measured using a high-resolution laser confocal microscope (LCM). A shift of the LCM PL peak of the MoS2/WSe2 n-p hybrid nanostructures was observed owing to the charge transfer. In contrast, the shift of the LCM PL peak of the MoS2/h-BN/WSe2 n-insulator-p hybrid nanostructure was not considerable, as the inserted h-BN dielectric layer prevented the charge transfer. The intensity of the LCM PL peak of the MoS2/h-BN/WSe2 hybrid nanostructure considerably increased once the nanostructure was loaded on the Au-NPo array, owing to the energy transfer between the 2D materials and the Au-NPo array at the SPR condition, which was confirmed by the increase in the LCM Raman intensity. Published by AIP Publishing.
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