Tungsten Ditelluride Crystal
|Size||Product code||Size description*||Quantity (EA)||Price|
*typical representative size, areas/dimensions may vary
**item with a lead time of 2-3 weeks, please contact for more information
|Molecular weight||439.04 g/mol|
|Bandgap||~0.7 eV |
|Synonyms||Tungsten telluride, Tungsten (IV) telluride|
|Classification/ Family||Transition metal dichalcogenides (TMDCs), 2D semiconductor materials, Nano-electronics, Nano-photonics, Materials science|
|Acquisition Method||Synthetic - Chemical Vapour Transport (CVT)|
|Electronic properties||2D Semiconductor|
|Melting point||1020 °C (lit.)|
|Colour||Metallic Black/dark brown|
2D-layered tungsten ditelluride (WTe2) has recently received great research interest for its unique, non-saturating, and extremely large positive magnetoresistance (XMR) behaviour. With perfectly balanced electron-hole populations, this particular non-saturating XMR identified applications for WTe2 in information processing and storage devices.
In ambient conditions, WTe2 crystallises in a orthorhombic lattice - where tungsten atoms are coordinated by tellurium atoms in an octahedral environment. The unit cell contains two Te-W-Te layers (held together by van der Waals interaction), with one sheet rotating 180◦ with respect to the other. This stacking sequence is referred to as a 'distorted 1T (Td) structure'.
Td-WTe2 was the first material proposed to be a type II Weyl semimetal, with a reduced density of states at the Fermi level coming from a small overlap between valence and conduction bands without a band gap. It has been reported that even single and dual-layer WTe2 films preserve the semimetallic nature, and both the films have equal hole and electron carrier concentrations. Additionally, WTe2 has been reported to exhibit pressure-induced superconductivity.
With the distorted 1T (Td) form being thermodynamically-favoured and semi-metal in nature, WTe2 finds applications in pressure-induced superconductivity, memory storage devices, batteries, catalyst, spintronics, and thermo-electric devices.
Tungsten ditelluride (WTe2) is manufactured via chemical vapour transport (CVT) crystallisation, with high purity levels (>99.999%).
Tungsten ditelluride is a great source for obtaining mono- and few-layer WTe2 via mechanical or liquid exfoliation. Single crystals can also be used directly for optical and scanning probe microscopy (such as AFM and TEM studies).
Literature and Reviews
- Tungsten Ditelluride: a layered semimetal, C-H. Lee et al., Sci. Rep., 5, 10013 (2015); DOI: 10.1038/srep10013.
Visualizing Type-II Weyl Points in Tungsten Ditelluride by Quasiparticle Interference, C-L. Lin et al., ACS Nano, 11 (11), 11459–11465 (2017);
- Three-dimensionality of the bulk electronic structure in WTe2, Y. Wu et al., Phys. Rev. B, 95, 195138 (2017) DOI: 10.1103/PhysRevB.95.195138.,
- Electronic Structure Basis for the Extraordinary Magnetoresistance in WTe2, I. Pletikosić et al., Phys. Rev. Lett., 113, 216601 (2014); DIO: 10.1103/PhysRevLett.113.216601.
- MoTe2: A Type-II Weyl Topological Metal, Z. Wang et al., Phys. Rev. Lett., 117, 056805 (2016); DOI: 10.1103/PhysRevLett.117.056805.