Universität zu Köln

van Efferen, Camiel ORCID: 0000-0002-6237-8602, Murray, Clifford, Fischer, Jeison, Busse, Carsten ORCID: 0000-0001-5522-0578, Komsa, Hannu-Pekka ORCID: 0000-0002-0970-0957, Michely, Thomas ORCID: 0000-0003-1657-1847 and Jolie, Wouter (2022). Metal-insulator transition in monolayer MoS2 via contactless chemical doping. 2D Mater., 9 (2). BRISTOL: IOP Publishing Ltd. ISSN 2053-1583

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Abstract

Much effort has been made to modify the properties of transition metal dichalcogenide layers via their environment as a route to new functionalization. However, it remains a challenge to induce large electronic changes without chemically altering the layer or compromising its two-dimensionality. Here, a non-invasive technique is used to shift the chemical potential of monolayer MoS2 through p- and n-type doping of graphene (Gr), which remains a well-decoupled 2D substrate. With the intercalation of oxygen (O) under Gr, a nearly rigid Fermi level shift of 0.45 eV in MoS2 is demonstrated, whereas the intercalation of europium (Eu) induces a metal-insulator transition in MoS2, accompanied by a giant band gap reduction of 0.67 eV. Additionally, the effect of the substrate charge on 1D states within MoS2 mirror-twin boundaries (MTBs) is explored. It is found that the 1D nature of the MTB states is not compromised, even when MoS2 is made metallic. Furthermore, with the periodicity of the 1D states dependent on substrate-induced charging and depletion, the boundaries serve as chemical potential sensors functional up to room temperature.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code van Efferen, Camiel UNSPECIFIED orcid.org/0000-0002-6237-8602 UNSPECIFIED Murray, Clifford UNSPECIFIED UNSPECIFIED UNSPECIFIED Fischer, Jeison UNSPECIFIED UNSPECIFIED UNSPECIFIED Busse, Carsten UNSPECIFIED orcid.org/0000-0001-5522-0578 UNSPECIFIED Komsa, Hannu-Pekka UNSPECIFIED orcid.org/0000-0002-0970-0957 UNSPECIFIED Michely, Thomas UNSPECIFIED orcid.org/0000-0003-1657-1847 UNSPECIFIED Jolie, Wouter UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-678510
DOI:	10.1088/2053-1583/ac5d0f
Journal or Publication Title:	2D Mater.
Volume:	9
Number:	2
Date:	2022
Publisher:	IOP Publishing Ltd
Place of Publication:	BRISTOL
ISSN:	2053-1583
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TOTAL-ENERGY CALCULATIONS; SINGLE-LAYER MOS2; INDUCED SUPERCONDUCTIVITY; WORK FUNCTION; GRAPHENE; DENSITY; SURFACE; GAP; PARTICLE; IR(111) Multiple languages Materials Science, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/67851