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Synthesis and Physical Properties of Phase-Engineered Transition Metal Dichalcogenide Monolayer Heterostructures

Authors :
Carl H. Naylor
Qicheng Zhang
William M. Parkin
Andrew M. Rappe
Liang Z. Tan
Zhaoli Gao
Songsong Zhou
Ram Surya Gona
Marija Drndic
Joel Berry
Robert W. Carpick
Meng-Qiang Zhao
J. B. McClimon
Christopher E. Kehayias
David J. Srolovitz
Alan T. Johnson
Source :
ACS Nano. 11:8619-8627
Publication Year :
2017
Publisher :
American Chemical Society (ACS), 2017.

Abstract

Heterostructures of transition metal dichalcogenides (TMDs) offer the attractive prospect of combining distinct physical properties derived from different TMD structures. Here, we report direct chemical vapor deposition of in-plane monolayer heterostructures based on 1H-MoS2 and 1T′-MoTe2. The large lattice mismatch between these materials led to intriguing phenomena at their interface. Atomic force microscopy indicated buckling in the 1H region. Tip-enhanced Raman spectroscopy showed mode structure consistent with Te substitution in the 1H region during 1T′-MoTe2 growth. This was confirmed by atomic resolution transmission electron microscopy, which also revealed an atomically stitched, dislocation-free 1H/1T′ interface. Theoretical modeling revealed that both the buckling and absence of interfacial misfit dislocations were explained by lateral gradients in Te substitution levels within the 1H region and elastic coupling between 1H and 1T′ domains. Phase field simulations predicted 1T′ morphologies with ...

Details

ISSN :
1936086X and 19360851
Volume :
11
Database :
OpenAIRE
Journal :
ACS Nano
Accession number :
edsair.doi.dedup.....5ac6457b43b450be39e56956bb44e597
Full Text :
https://doi.org/10.1021/acsnano.7b03828