[en] The development of high-quality chemical vapor-deposited mono- and few-layer MoS2 is of high relevance for future applications in functional devices. Consequently, a detailed understanding of the growth mode and the parameters affecting it is important. Here, we show for the case of mono- and few-layer MoS2 grown on Muscovite mica, how strain and temperature impact the growth mode. We show how misleading the determination of the number of MoS2 layers is, solely based on Raman spectroscopy due to the occurrence of strain and changes in the growth mode. A combination of atomic force microscopy, Raman spectroscopy, and ab initio calculations reveal that that the growth at 500 dgree C synthesis temperature exhibits a strained layer-by-layer growth of up to three mono-layers, whereas at 700 degree C, a strain release occurs and layer-by-layer growth is confined to the first mono-layer only. We relate the occurrence of strain to the formation of gas bubbles below the MoS2 film, escaping the mica sheets during high temperature synthesis. Our analysis shows that mica substrates can be used to study strain in 2D materials without the need to apply external stress and that a detailed knowledge of the MoS2 morphology is necessary to correctly interpret the Raman results.
Disciplines :
Physique
Auteur, co-auteur :
ROMMELFANGEN, Jonathan ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
REICHARDT, Sven ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
Ben Chu, Van
WIRTZ, Ludger ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
DALE, Phillip ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
REDINGER, Alex ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
Co-auteurs externes :
no
Langue du document :
Anglais
Titre :
The impact of strain on growth mode in chemical vapor deposited mono- and few-layer MoS2
Date de publication/diffusion :
2022
Titre du périodique :
AIP Adv.
ISSN :
2158-3226
Maison d'édition :
American Institute of Physics
Volume/Tome :
12
Fascicule/Saison :
6
Pagination :
065010
Peer reviewed :
Peer reviewed
Focus Area :
Physics and Materials Science
Projet FnR :
FNR13584473 - Functionalization Of Mos2 Via Ion Beams And Alkali Metals, 2019 (15/09/2019-14/09/2023) - Jonathan Rommelfangen
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