NbTe2 Crystal

SKU:
BLK-NbTe2
Condition:
New
  • NbTe2 crystals - 2Dsemiconductors USA
  • XRD data NbTe2 crystals
$590.00
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Description

Niobium ditelluride (NbTe2) crystal is layered semimetal with charge density wave ground state and superconducting transition at ~1K. While its bulk superconducting transition has been demonstrated at ~1K, its behavior in the monolayer limit remains unknown. Our crystals are 100% environmentally stable : In the bulk form, niobium ditelluride is metallic. Similar to molybdenum disulfide, it has layered structure (lamellar) with weak interlayer coupling. NbTe2 displays metallic and superconducting behavior. Undergoes superconducting transition around 1.1 K in bulk, but predicted to higher for thinner sheets. Unlike other sources, our NbTe2 crystals are grown by defect and impurity free flux zone technique (see the comparison between chemical vapor transport [CVT] below). Clean and defect free nature enabled researchers to observe clean superconductivity, phase transitions, and perform quantum transport measurements with confidence in the crystal. 

If your research needs atomically flat NbTe2 samples for scanning tunneling microscopy (STM) measurements please contact us.

Properties of NbTe2 crystals by 2Dsemiconductors USA

Material properties Metal and superconductor (some semiconducting behaviour in 2D)
Crystal structure Monoclinic phase
Unit cell parameters a=1.442 nm, b=0.373 nm, c=0.952 nm; α=β=90° γ=108.3°
Growth method [Default] Flux zone (no halide contamination) defect free
[Optional CVT]: Contains Br2, Cl2, TeCl4, and other halides
Purity 99.9999%

 

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 NbTe2 crystals
nbte2-xrd.png
 
 
 
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Additional Information

Elements:
Nb,Te
Element:
Niobium
Element:
Tellurium
Formula:
NbTe2
Material class:
MX2
Material class:
Dichalcogen
Properties:
Superconductor
Properties:
Semimetal
Properties:
CDW
Growth method:
Flux
Growth method:
CVT
Doping:
Undoped
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