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Product Code M2223F11-1EA
Price £560 ex. VAT

High purity tungsten diselenide monolayer film

For applications in electronic and optoelectronic devices

Technical Data | MSDS | Literature and Reviews | Related Products | Resources and Support

Pristine tungsten diselenide (WSe2), CAS number 12067-46-8, is known to show ambipolar behaviour with a slightly hole conducting n-doped character. Doping treatments could increase the effective carrier mobilities up to four orders of magnitude above the threshold region with respect to the pristine WSe2, reaching maximum values of 82 cm2V-1s-1 (p-doping) and 25 cm2V-1s-1 (n-doping) for holes and electrons, respectively.

Chemical vapor deposition (CVD) grown tungsten diselenide monolayers show PLQY approaching 60%, exceeding that of exfoliated crystals by over an order of magnitude. Monolayer of tungsten diselenide is of particular interest since it possesses a direct band gap and tuneable charge transport behaviours, which make it suitable for a variety of electronic and optoelectronic applications. Monolayer WSe2 has a band gap smaller than monolayer MoS2 (∼1.65 eV for monolayer WSe2 versus 1.8 eV for monolayer MoS2). Top-gated field-effect transistors based on WSe2 monolayers using ionic gels as the dielectrics exhibit ambipolar characteristics, where the hole and electron mobility values are up to 90 and 7 cm2/Vs, respectively.

High Purity 12067-46-8

High Purity

≥99.999% Crystal Purity

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Low Cost 12067-46-8

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Low Cost Tungsten Diselenide

Applications of Tungsten Diselenide


Applications in electronic and optoelectronic devices

Technical Data

CAS Number 12067-46-8
Chemical Formula WSe2
Molecular Weight 341.76 g/mol
Bandgap 1.65 eV
Synonyms Tungsten selenide, Tungsten(IV) Selenide
Classification / Family Transition metal dichalcogenides (TMDCs), 2D semiconductor materials, Nano-electronics, Nano-photonics, Materials science

Product Details

Substrate Sapphire - Double Side Polished
Product Code M2223F11
Size 1 cm × 1 cm*
Growth Method CVD synthesis
Appearance Transparent
Purity >99%
Transparency >97%
Coverage >95%
Number of Layers 1
Sheet Resistance N/A
Transfer Method Directly grown

*Other sizes available: up to 2 cm × 2 cm or 2 inches in diameter.

High-quality tungsten diselenide (WSe2) monolayer films are available on Sapphire as standard. Different substrates of monolayer WSe2 films, including SiO2/Si, Glass, Silicon and Quartz are also available via custom order.

Discontinuous isolated triangular crystals (crystal islands) films are also available via custom request. Please contact us for more information regarding custom products.

MSDS Document

Tungsten Diselenide Monolayer Film MSDSTungsten Diselenide Monolayer Film MSDS Sheet

Literature and Reviews

  • Large-Area Synthesis of Highly Crystalline WSe2 Monolayers and Device Applications, J. Huang et al., ACS Nano, 8 (1), 923–930 (2014); DOI: 10.1021/nn405719x.
  • Observation of biexcitons in monolayer WSe2, Y. You et al., Nature Phys., 11, 477–481 (2015): DOI: 10.1038/nphys3324.
  • Electrical control of second-harmonic generation in a WSe2 monolayer transistor, K. Seyler et al., Nat. Nanotech 10, 407–411 (2015); DOI: 10.1038/nnano.2015.73.

We stock a wide range of 2D materials available to purchase online. Please contact us if you cannot find what you are looking for.

Resources and Support

Viscoelastic Transfer of 2D Material Using PDMS

Viscoelastic transfer using polydimethylsiloxane (PDMS) stamps is one of the methods used for the deterministic placement of 2D materials and the fabrication of van der Waals heterostructures. It relies on the viscoelasticity of PDMS, which behaves as an elastic solid on short time scales, but as a viscous fluid on long time scales.

Learn more...
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