An effective approach to synthesize monolayer tungsten disulphide crystals using tungsten halide precursor

Journal Article · Mon Feb 01 04:00:00 EST 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4941393· OSTI ID:22489413

Thangaraja, Amutha; Shinde, Sachin M.; Kalita, Golap; Tanemura, Masaki ^[1]

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1. Department of Frontier Materials, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555 (Japan)

The synthesis of large-area monolayer tungsten disulphide (WS{sub 2}) single crystal is critical for realistic application in electronic and optical devices. Here, we demonstrate an effective approach to synthesize monolayer WS{sub 2} crystals using tungsten hexachloride (WCl{sub 6}) as a solid precursor in atmospheric chemical vapor deposition process. In this technique, 0.05M solution of WCl{sub 6} in ethanol was drop-casted on SiO{sub 2}/Si substrate to create an even distribution of the precursor, which was reduced and sulfurized at 750 °C in Ar atmosphere. We observed growth of triangular, star-shaped, as well as dendritic WS{sub 2} crystals on the substrate. The crystal geometry evolves with the shape and size of the nuclei as observed from the dendritic structures. These results show that controlling the initial nucleation and growth process, large WS{sub 2} single crystalline monolayer can be grown using the WCl{sub 6} precursor. Our finding shows an easier and effective approach to grow WS{sub 2} monolayer using tungsten halide solution-casting, rather than evaporating the precursor for gas phase reaction.

• OSTI ID: 22489413
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 5 Vol. 108; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
CHEMICAL VAPOR DEPOSITION
DENDRITES
DISTRIBUTION
EQUIPMENT
ETHANOL
MONOCRYSTALS
NUCLEATION
PRECURSOR
SILICON OXIDES
SUBSTRATES
TUNGSTEN
TUNGSTEN CHLORIDES
TUNGSTEN SULFIDES