Tungsten Diselenide

Tungsten diselenide is a gray inorganic compound, the main structure is composed of the upper and lower layer which is the selenium atom and the intermediate layer is tungsten atoms. Besides, every layer combined with van der Waals force, so tungsten diselenide in sixth metal dichalcogenides are very stable semiconductors. Its physical properties are as follows: the chemical formula: WSe2, molar mass: 341.76 • mol-1, density 9.32, CAS number: 12067-46-8.
Tungsten diselenide is often used in solar cells photovoltaic devices, while WSe2 photoelectrode in very stable under acidic and alkaline, and therefore it can be used in photovoltaic chemical barrier. Also WSe2 monolayer which is mechanical exfoliation can be used in the production of transparent photovoltaic equipment and ultra-thin LED.
Producing tungsten diselenide can put tungsten sheet in selenium vapor at high pressure and high temperature (over 800K) heating, then using sputtering deposition techniques to form hexagonal crystal on the sheet with right element proportion.

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