Control of the metal/WS 2 contact properties using 2-dimensional buffer layers

Krystian Nowakowski* (Corresponding Author), Rik Van Bremen, Harold J.W. Zandvliet, Pantelis Bampoulis (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)
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Abstract

Transition metal dichalcogenides (TMDC) have recently attracted much attention as a promising platform for the realization of 2-dimensional (2D) electronic devices. One of the major challenges for their wide-scale application is the control of the potential barrier at the metal/TMDC junction. Using conductive atomic force microscopy (c-AFM) we have investigated modifications of the Schottky barrier height (SBH) across a Pt/WS 2 junction by the introduction of thin buffer layers of graphene and MoSe 2 . While graphene greatly reduces the contact resistance in both bias directions, thin layers of MoSe 2 lower the Schottky barrier and leave the rectifying properties of the junction intact. We have studied the dependence of the transport properties on the thickness of the graphene and MoSe 2 buffer layers. In both cases, the charge transport characteristics can be tailored by varying the buffer layer thickness. The edge of single layer graphene is observed to form an ohmic contact to the underlying WSe 2 substrate. This study demonstrates that the introduction of atomically thin MoSe 2 and graphene buffer layers is a feasible and elegant method to control the Schottky barrier when contacting TMDCs. The results are important for the fabrication of devices utilizing 2D materials.

Original languageEnglish
Pages (from-to)5548-5556
Number of pages9
JournalNanoscale
Volume11
Issue number12
Early online date27 Feb 2019
DOIs
Publication statusPublished - 28 Mar 2019

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