Universität zu Köln

Valerius, Philipp, Kretschmer, Silvan, Senkovskiy, Boris V. ORCID: 0000-0003-1443-6780, Wu, Shilong, Hall, Joshua, Herman, Alexander, Ehlen, Niels, Ghorbani-Asl, Mahdi, Grueneis, Alexander, Krasheninnikov, Arkady V. and Michely, Thomas (2020). Reversible crystalline-to-amorphous phase transformation in monolayer MoS2 under grazing ion irradiation. 2D Mater., 7 (2). BRISTOL: IOP PUBLISHING LTD. ISSN 2053-1583

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Abstract

By combining scanning tunneling microscopy, low-energy electron diffraction, photoluminescence and Raman spectroscopy experiments with molecular dynamics simulations, a comprehensive picture of the structural and electronic response of a monolayer of MoS2 to 500 eV Xe+ irradiation is obtained. The MoS2 layer is epitaxially grown on graphene/Ir(1 1 1) and analyzed before and after irradiation in situ under ultra-high vacuum conditions. Through optimized irradiation conditions using low-energy ions with grazing trajectories, amorphization of the monolayer is induced already at low ion fluences of ions cm(-2) and without inducing damage underneath the MoS2 layer. The crystalline-to-amorphous transformation is accompanied by changes in the electronic properties from semiconductor-to-metal and an extinction of photoluminescence. Upon thermal annealing, the re-crystallization occurs with restoration of the semiconducting properties, but residual defects prevent the recovery of photoluminescence.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Valerius, Philipp UNSPECIFIED UNSPECIFIED UNSPECIFIED Kretschmer, Silvan UNSPECIFIED UNSPECIFIED UNSPECIFIED Senkovskiy, Boris V. UNSPECIFIED orcid.org/0000-0003-1443-6780 UNSPECIFIED Wu, Shilong UNSPECIFIED UNSPECIFIED UNSPECIFIED Hall, Joshua UNSPECIFIED UNSPECIFIED UNSPECIFIED Herman, Alexander UNSPECIFIED UNSPECIFIED UNSPECIFIED Ehlen, Niels UNSPECIFIED UNSPECIFIED UNSPECIFIED Ghorbani-Asl, Mahdi UNSPECIFIED UNSPECIFIED UNSPECIFIED Grueneis, Alexander UNSPECIFIED UNSPECIFIED UNSPECIFIED Krasheninnikov, Arkady V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Michely, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-339888
DOI:	10.1088/2053-1583/ab5df4
Journal or Publication Title:	2D Mater.
Volume:	7
Number:	2
Date:	2020
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	2053-1583
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TRANSITION; EVOLUTION Multiple languages Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/33988