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

Zhenping Wang, Qing Cao, Kai Sotthewes, Yalei Hu, Hyeon S. Shin*, Siegfried Eigler

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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.

Original languageEnglish
Pages (from-to)15464-15470
Number of pages7
JournalNanoscale
Volume13
Issue number36
DOIs
Publication statusPublished - 28 Sep 2021

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