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Distinct photoluminescence and Raman spectroscopy signatures for identifying highly crystalline WS2 monolayers produced by different growth methods

Authors :
Victor Carozo
Bernd Kabius
David A. Cullen
Mauricio Terrones
Nestor Perea-Lopez
Ayse Berkdemir
Amber McCreary
Ana Laura Elías
Kazunori Fujisawa
Junjie Wang
Thomas E. Mallouk
Minh An T. Nguyen
Jun Zhu
Source :
Journal of Materials Research. 31:931-944
Publication Year :
2016
Publisher :
Springer Science and Business Media LLC, 2016.

Abstract

Transition metal dichalcogenides such as WS2 show exciting promise in electronic and optoelectronic applications. Significant variations in the transport, Raman, and photoluminescence (PL) can be found in the literature, yet it is rarely addressed why this is. In this report, Raman and PL of monolayered WS2 produced via different methods are studied and distinct features that indicate the degree of crystallinity of the material are observed. While the intensity of the LA(M) Raman mode is found to be a useful indicator to assess the crystallinity, PL is drastically more sensitive to the quality of the material than Raman spectroscopy. We also show that even exfoliated crystals, which are usually regarded as the most pristine material, can contain large amounts of defects that would not be apparent without Raman and PL measurements. These findings can be applied to the understanding of other two-dimensional heterostructured systems.

Details

ISSN :
20445326 and 08842914
Volume :
31
Database :
OpenAIRE
Journal :
Journal of Materials Research
Accession number :
edsair.doi.dedup.....ae330bc4850f77787c17289e4a18791e
Full Text :
https://doi.org/10.1557/jmr.2016.47