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Product Code M2303C1-500mg
Price £220 ex. VAT

Low price, high purity 2D metal germanium sulfide powder and crystals

For the development of next-generation electronics, optoelectronics, and nanotechnology

Technical Data | MSDS | Structure | Literature and Reviews | Related Products | Resources and Support

Germanium sulfide (GeS), CAS number 12025-32-0, is a group IV layered monochalcogenide with a similar atomic puckered structure to black phosphorus (BP) and a bandgap in the visible region (1.65 – 1.8 eV). Like BP, it has anisotropic optical properties, with low energy optical excitations along the armchair and zigzag directions. The anisotropic crystal structure of GeS gives rise to anisotropy in the optoelectronic properties, such as polarized optical absorption, photoconductivity. 

High Purity Germanium Sulfide

High Purity

High purity Germanium Sulfide ≥99.995% powder

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Low price 12025-32-0

Low price

Low price Germanium Sulfide

powder and crystals Germanium Sulfide

Different Forms

Available in powder and crystals

With a bandgap of 1.65 eV, GeS as a layered semiconductors with a distorted rock-salt orthorhombic structure and a p-type semiconductor, is considered to be a promising photovoltaic material for high-efficiency solar cell and photodetectors with high sensitivity and external quantum efficiency. Nanoparticles, nanosheets, nanoflowers and nanowires of GeS with unique structures and physical properties have been developed for different applications.

Germanium selenide (GeSe) Powder from Ossila was used in the high-impact paper (IF 11.19), γ-GeSe: A New Hexagonal Polymorph from Group IV–VI Monochalcogenides, S. Lee et al., Nano Lett. 21, 4305–4313 (2021); DOI: 10.1021/acs.nanolett.1c00714.

Also with an indirect band gap of 2.34 eV which can be further fine tuned by external strain, GeS monolayer is semiconducting and its monolayer has an electron mobility of 3,680 cm2 V−1 s−1, much higher than that of MoS2 monolayer. GeS monolayers have been mostly been fabricated by mechanical and chemical exfoliations from bulk crystals or high-purity powders. Structurally pristine with minimal chemical degradation sub-10 nm thick GeS nanosheets can be achieved with liquid-phase exfoliation (LPE) in anhydrous N-methyl-2-pyrrolidone (NMP).

We supply low price Germanium sulfide in several different forms for a range of applications.

Germanium sulfide powder

Germanium Sulfide Powder

Can be used for preparation of germanium sulfide nanoplates and ultrathin films

Sold by weight

≥99.995% purity

From £220

Germanium sulfide crystal

Germanium Sulfide Crystals by Size

Can be used to produce single or few-layer germanium sulfide sheets via mechanical or liquid exfoliation

Small (≥10 mm2) or medium (≥25 mm2) crystals available*

≥99.999% purity

From £520

*Typical representative size, areas/dimensions may vary

Bulk single Germanium sulfide crystal is most commonly used as sources from which single or few-layer sheets can be obtained via either mechanical or liquid exfoliation. 

High purity germanium sulfide powder can also be used to prepare GeS nanosheets and nanoparticles by liquid-exfoliation (normally assisted by sonication). 

Technical Data

CAS Number 12025-32-0
Chemical Formula GeS
Molecular Weight 104.71 g/mol
Bandgap 1.65 eV (indirect)
Preparation Synthetic - Chemical Vapour Transport (CVT)
Structure Orthorhombic
Electronic Properties 2D semiconductor
Melting Point 615 °C (lit)
Colour Dark grey
Synonyms Germanium(II) sulfide, Germanium monosulfide
Classification / Family Transition metal monochalcogenides (TMDCs), 2D semiconductor materials, Nano-electronics, Nano-photonics, Photovoltaic, Materials science

Product Details

Form Purity
Powder ≥99.995%
Crystal ≥99.999%

Pricing Table

Product Code Form Size/Weight* Price
M2303C1 Powder 500 mg £220
M2303C1 Powder 1 g £350
M2303A10 Crystal Small (≥10 mm2) £520 ea.
M2303A25 Crystal Medium (≥25 mm2) £850 ea.

*typical representative size, areas/dimensions may vary

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MSDS Documents

Germanium sulfide powder MSDSGermanium sulfide powder

Germanium sulfide crystal MSDSGermanium sulfide crystal

Structure of Germanium Sulfide

Germanium sulfide (GeS) belongs to the Group IV layered metal mono-chalcogenides. It is a layered material with structure analogous to that of black phosphorus. GeS crystallizes in a layered structure of distorted orthorhombic symmetry of space group Pcmn - D2h16. Bulk GeS has a unique structural characteristic with a puckered configuration along the x (armchair) direction and a bilayer structure along the y (zigzag) direction. Each of the monolayers stack along the z-axis and the unit cell comprises two adjacent double layers. 

GeS orthorhombic form (also called α-GeS) has been proven to be dynamically and thermally stable at room temperature.

germanium sulfide crystal structure
Top and side view of single-layer germanium sulfide (GeS), CAS 12025-32-0.

Literature and Reviews

  • Ultrahigh drive current and large selectivity in GeS selector, S. Jia et al., Nat . Commun., 11, 4636 (2020); DOI: 10.1038/s41467-020-18382-z.
  • Polarized Band-Edge Emission and Dichroic Optical Behavior in Thin Multilayer GeS, C-H. Ho et al., dv. Optical Mater., 5, 1600814 (2017); DOI: 10.1002/adom.20160081.
  • Anisotropic optical and electronic properties of two dimensional layered germanium sulfide, D.Tan et al., Nano Res. 10, 546–555 (2017); DOI: 10.1007/s12274-016-1312-6.

We stock a wide range of 2D materials available to purchase online. Please contact us if you cannot find what you are looking for.

Resources and Support

Viscoelastic Transfer of 2D Material Using PDMS

Viscoelastic transfer using polydimethylsiloxane (PDMS) stamps is one of the methods used for the deterministic placement of 2D materials and the fabrication of van der Waals heterostructures. It relies on the viscoelasticity of PDMS, which behaves as an elastic solid on short time scales, but as a viscous fluid on long time scales.

Learn more...
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