Niobium Disulfide (NbS2)
Niobium disulfide (NbS2) is a 2D metal (3R-phase) and 2D superconductor (2H-phase) depending on the crystalline phases (3R vs 2H phases). In its 2H-phase, our crystals demonstrate superconducting transition at around 7K. Our NbS2 crystals are grown by two distinct methods as summarized below (CVT vs flux zone). Clean and defect free crystal growth enabled us to create the only commercially available NbS2 vdW crystals with guaranteed CDW and superconducting responses. If your research needs atomically flat NbS2 samples for scanning tunneling microscopy (STM) measurements please contact us. Please specify the phase of NbS2 (3R- or 2H-phase) during check out.
Properties of NbS2 crystals by 2Dsemiconductors USAGrowth 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