Description
Niobium disulfide (NbS2) is a versatile 2D material, exhibiting metallic properties in its 3R-phase and superconductivity in its 2H-phase.
Our defect-free crystals are the only commercially available van der Waals NbS2 with guaranteed charge density wave (CDW) and superconducting responses. They also come at world record sizes (guaranteed) If you require atomically flat NbS2 for scanning tunneling microscopy (STM), please reach out to us. Be sure to specify the desired phase (3R or 2H) when placing your order.
Properties of NbS2 crystals by 2Dsemiconductors USA
| Material properties | Metal and superconductor (some semiconducting behaviour in 2D) |
| Crystal size | +4mm world record size guaranteed |
| Crystal structure | Hexagonal phase |
| unit cell parameters | a=b=0.330 nm, c=1.121 nm, α=β=90°, γ=120° |
| Growth method | [Default] Flux zone (no halide contamination) defect free [Optional CVT]: Contains Br2, Cl2, TeCl4, and other halides |
| Purity | 99.9999% confirmed |
Growth method matters> Flux zone or CVT growth method? Contamination of halides and point defects in layered crystals are well known cause for their reduced electronic mobility, reduced anisotropic response, poor e-h recombination, low-PL emission, and lower optical absorption. Flux zone technique is a halide free technique used for synthesizing truly semiconductor grade vdW crystals. This method distinguishes itself from chemical vapor transport (CVT) technique in the following regard: CVT is a quick (~2 weeks) growth method but exhibits poor crystalline quality and the defect concentration reaches to 1E11 to 1E12 cm-2 range. In contrast, flux method takes long (~3 months) growth time, but ensures slow crystallization for perfect atomic structuring, and impurity free crystal growth with defect concentration as low as 1E9 - 1E10 cm-2. During check out just state which type of growth process is preferred. Unless otherwise stated, 2Dsemiconductors ships Flux zone crystals as a default choice.
XRD data collected from high quality NbS2 crystals
Additional Information
Elements: |
Nb,S |
Element: |
Niobium |
Element: |
Sulfur |
Formula: |
NbS2 |
Material class: |
MX2 |
Material class: |
Dichalcogen |
Properties: |
Superconductor |
Properties: |
Semimetal |
Growth method: |
Flux |
Growth method: |
CVT |
Doping: |
Undoped |