Universität zu Köln

Hall, Joshua, Pielic, Borna, Murray, Clifford, Jolie, Wouter, Wekking, Tobias, Busse, Carsten ORCID: 0000-0001-5522-0578, Kralj, Marko ORCID: 0000-0002-9786-3130 and Michely, Thomas (2018). Molecular beam epitaxy of quasi-freestanding transition metal disulphide monolayerson van der Waals substrates: a growth study. 2D Mater., 5 (2). BRISTOL: IOP PUBLISHING LTD. ISSN 2053-1583

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Abstract

Based on an ultra-high vacuum compatible two-step molecular beam epitaxy synthesis with elemental sulphur, we grow clean, well-oriented, and almost defect-free monolayer islands and layers of the transition metal disulphides MoS2, TaS2 and WS2. Using scanning tunneling microscopy and low energy electron diffraction we investigate systematically how to optimise the growth process, and provide insight into the growth and annealing mechanisms. A large band gap of 2.55 eV and the ability to move flakes with the scanning tunneling microscope tip both document the weak interaction of MoS2 with its substrate consisting of graphene grown on Ir(1 1 1). As the method works for the synthesis of a variety of transition metal disulphides on different substrates, we speculate that it could be of great use for providing hitherto unattainable high quality monolayers of transition metal disulphides for fundamental spectroscopic investigations.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Hall, Joshua UNSPECIFIED UNSPECIFIED UNSPECIFIED Pielic, Borna UNSPECIFIED UNSPECIFIED UNSPECIFIED Murray, Clifford UNSPECIFIED UNSPECIFIED UNSPECIFIED Jolie, Wouter UNSPECIFIED UNSPECIFIED UNSPECIFIED Wekking, Tobias UNSPECIFIED UNSPECIFIED UNSPECIFIED Busse, Carsten UNSPECIFIED orcid.org/0000-0001-5522-0578 UNSPECIFIED Kralj, Marko UNSPECIFIED orcid.org/0000-0002-9786-3130 UNSPECIFIED Michely, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-192271
DOI:	10.1088/2053-1583/aaa1c5
Journal or Publication Title:	2D Mater.
Volume:	5
Number:	2
Date:	2018
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	2053-1583
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SINGLE-LAYER MOS2; DENSITY-WAVE ORDER; VALLEY POLARIZATION; MORPHOLOGY; SULFUR; DICHALCOGENIDES; NANOCLUSTERS; BOUNDARIES; PYRITE; SNSE2 Multiple languages Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/19227