Bandgap inhomogeneity of MoS$_2$ monolayer on epitaxial graphene bilayer in van der Waals p-n junction - Archive ouverte HAL Access content directly
Journal Articles Carbon Year : 2016

Bandgap inhomogeneity of MoS$_2$ monolayer on epitaxial graphene bilayer in van der Waals p-n junction

(1) , (1) , (2) , (1) , (1) , (3) , (3) , (2) , (3) , (1)
1
2
3

Abstract

Atomically thin MoS$_2$/graphene vertical heterostructures are promising candidates for nanoelectronic and optoelectronic technologies.In this work, we studied the optical and electronic properties of n doped single layer MoS$_2$ on p doped bilayer graphene vdW heterostructures. We demonstrate a non-uniform strain between two different orientation angles of MoS$_2$ monolayer on top of epitaxial bilayer gra-phene. A significant downshift of the E$^1$$_{2_g}$ mode, a slight downshift of the A$_{1_g}$ mode, and photo-luminescence shift and quenching are observed between two MoS$_2$ monolayers differently oriented with respect to graphene; This could be mostly attributed to the strain-induced transition from direct to indirect bandgap in monolayer MoS$_2$. Moreover, our theoretical calculations about differently-strained MoS$_2$ monolayers are in a perfect accordance with the experimentally observed behavior of differently-oriented MoS$_2$ flakes on epitaxial bilayer graphene. Hence, our results show that strain-induced bandgap engineering of single layered MoS$_2$ is dependent on the orientation angle between stacked layers. These findings could be an interesting novel way to take advantage of the possibilities of MoS$_2$ and deeply exploit the capabilities of MoS$_2$/graphene van der Waals heterostructures.
Fichier principal
Vignette du fichier
1-s2.0-S0008622316308016-main.pdf (1.69 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

cea-01490885 , version 1 (16-03-2017)

Identifiers

Cite

Zeineb Ben Aziza, Hugo Henck, Daniela Di Felice, Debora Pierucci, Julien Chaste, et al.. Bandgap inhomogeneity of MoS$_2$ monolayer on epitaxial graphene bilayer in van der Waals p-n junction. Carbon, 2016, 110, pp.396 - 403. ⟨10.1016/j.carbon.2016.09.041⟩. ⟨cea-01490885⟩
160 View
486 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More