GeAs Crystal

SKU:
BLK-GeAs
Condition:
New
  • 1 cm size high quality GeAs germanium arsenide crystals by 2Dsemiconductors USA
  • 1 cm size high quality GeAs germanium arsenide crystals by 2Dsemiconductors USA
  • Raman spectrum of GeAs Germanium arsenide vdW crystal 2Dsemiconductors USA
$590.00
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Description

We provide the world's largest size commercially available GeAs crystals at the highest quality GeAs and affordable prices. Our crystals exceed competing crystals both in size and quality.

Description

Our single crystal GeAs (Germanium arsenide) crystals come with guaranteed  anisotropy, electronic, and optical grade crystal quality. They are developed at our facilities using state-of-art flux zone techniques. Each growth takes close to three months to provide you perfected crystals that does not contain any halides. In contrast to commonly used chemical vapor transport (CVT) technique, flux grown crystals are well known for their structural perfection and electronic/optical performance. Each crystal very large in size to last for years, is highly crystalline, oriented in 0001 direction, and easy to exfoliate. Our R&D staff takes characterization dataset in each sample piece to ensure structural, optical, and electronic consistency. 

Properties of GeAs vdW crystals 

Sample size 1cm in size
Material properties Anisotropic semiconductor (E₉ᵗʰᵉᵒʳʸ~0.7 eV bulk)
Crystal sturcture Monoclinic phase
Unit cell perameters Theory a=0.383 nm, b=0.853 nm, c=0.99 nm, α=104.4 β=90 y=102.97°
Growth method High pressure melt growth
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. 

Raman spectrum collected from GeAs vdW crystals

geas-raman-spectrum.png

 

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Additional Information

Elements:
Ge,As
Element:
Germanium
Element:
Arsenic
Formula:
GeAs
Material class:
MX
Properties:
Semiconductor
Properties:
High mobility
Band gap range:
IR
Growth method:
High pressure melt
Doping:
Undoped
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