Back to Search
Start Over
Distinct photoluminescence and Raman spectroscopy signatures for identifying highly crystalline WS2 monolayers produced by different growth methods
- 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.
- Subjects :
- Photoluminescence
Materials science
Mechanical Engineering
Nanotechnology
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
0104 chemical sciences
symbols.namesake
Crystallinity
Transition metal
Mechanics of Materials
Chemical physics
Monolayer
symbols
General Materials Science
0210 nano-technology
Raman spectroscopy
Luminescence
Subjects
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