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Shin, Hyeon Suk
Lab for Carbon and 2D Materials
Research Interests
  • Two-dimensional materials: graphene, transition metal dichalcogenides, h-BN, and their heterostructures

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Interlayer electron modulation in van der Waals heterostructures assembled by stacking monolayer MoS2 onto monolayer graphene with different electron transfer ability

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Title
Interlayer electron modulation in van der Waals heterostructures assembled by stacking monolayer MoS2 onto monolayer graphene with different electron transfer ability
Author
Wang, ZhenpingCao, QingSotthewes, KaiHu, YaleiShin, Hyeon SukEigler, Siegfried
Issue Date
2021-09
Publisher
ROYAL SOC CHEMISTRY
Citation
NANOSCALE, v.13, no.36, pp.15464 - 15470
Abstract
Achieving tunable optoelectronic properties and clarifying interlayer interactions are key challenges in the development of 2D heterostructures. Herein, we report the feasible modulation of the optoelectronic properties of monolayer MoS2 (1L-MoS2) on three different graphene monolayers with varying ability in extracting electrons. Monolayer oxygen-functionalized graphene (1L-oxo-G, a high amount of oxygen of 60%) with a work function (WF) of 5.67 eV and its lowly oxidized reduction product, namely reduced-oxo-G (1L-r-oxo-G, a low amount of oxygen of 0.1%), with a WF of 5.85 eV serving as hole injection layers significantly enhance the photoluminescence (PL) intensity of MoS2, whereas pristine monolayer graphene (1L-G) with a work function (WF) of 5.02 eV results in PL quenching of MoS2. The enhancement in the PL intensity is due to increase of neutral exciton recombination. Furthermore, 1L-r-oxo-G/MoS2 exhibited a higher increase (5-fold) in PL than 1L-oxo-G/MoS2 (3-fold). Our research can help modulate the carrier concentration and electronic type of 1L-MoS2 and has promising applications in optoelectronic devices.
URI
https://scholarworks.unist.ac.kr/handle/201301/54833
URL
https://pubs.rsc.org/en/content/articlelanding/2021/NR/D1NR03708K
DOI
10.1039/d1nr03708k
ISSN
2040-3364
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