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Product Code M2137A10
Price £520 ex. VAT

Low price, high purity 2D metal germanium selenide powder and crystal

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

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

Germanium selenide (GeSe), CAS number 12065-10-0, belongs to the Group IV layered metal mono-chalcogenides. It has a puckered layer structure similar to that of black phosphorus (BP). However, unlike BP, each germanium cation is triple-coordinated with a lone electron pair pointing to the inter-layer spacing. The lone electron pair thus is subject to inter-layer coupling to enhance the binding force between layers. 

High Purity Germanium Selenide

High Purity

High purity Germanium Selenide ≥99.995% powder

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Worldwide shipping

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Low price 12065-10-0

Low price

Low price Germanium Selenide

powder and crystals Germanium Selenide

Different Forms

Available in powder and crystals

The high quality of TMDC monolayers have mostly been fabricated by mechanical and chemical exfoliations from bulk crystals or high-purity powders. However, few-to-monolayer GeSe films with direct bandgaps are still hard to obtain by mechanical exfoliation due to the high fragility of GeSe mono-crystalline flakes. Liquid-phase exfoliation of high-purity powders is an alternative way to prepare GeSe nanosheets or nanoparticles.

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.

The strong covalent bonds within the layer but weak van der Waals interactions between the layers leads to the elimination of dangling bonds and surface states, which provides chemically-inert surfaces and considerably high chemical and environmental stability. So unlike phosphorene, devices based on GeSe provide greater stability and resistance to oxidation.

GeSe is the only Group IV mono-chalcogenide (MX) that has a direct bandgap. It has closely-placed direct and indirect bandgaps that overlap well with the solar spectrum, making it a potential material for photovoltaic and photodetecting applications. Germanium selenide (GeSe) is also the most attractive group IV chalcogenide due to its structural robustness, with isotropic lithiation kinetics and high rate capability. 

GeSe is also earth-abundant and environmentally-friendly, which makes it a particularly attractive candidate for applications like semiconductors. Out of its five free-standing polymorph forms, β-GeSe, γ-GeSe, δ-GeSe and ε-GeSe are indirect gap semiconductors, whereas α-GeSe is not.

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

Germanium selenide powder

Germanium Selenide Powder

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

Sold by weight

≥99.995% purity

From £220

Germanium selenide crystal

Germanium Selenide Crystals by Size

Can be used to produce single or few-layer germanium selenide 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 selenide crystal is most commonly used as sources from which single or few-layer sheets can be obtained via either mechanical or liquid exfoliation. 

Germanium selenide powder can also be used to prepare GeSe nanosheets and nanoparticles by liquid-exfoliation (normally assisted by sonication). 

Technical Data

CAS Number 12065-10-0
Chemical Formula GeSe
Molecular Weight 151.60 g/mol
Bandgap 1.07 eV
Preparation Synthetic - Chemical Vapour Transport (CVT)
Structure Orthorhombic
Electronic Properties 2D semiconductor
Melting Point 667 °C (decompose)
Colour Dark brown
Synonyms Germanium(II) selenide, Selanylidenegermanium
Classification / Family Transition metal monochalcogenides (TMMCs), 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
M2137C1 Powder 500 mg £220
M2137C1 Powder 1 g £350
M2137A10 Crystal Small (≥10 mm2) £520 ea.
M2137A25 Crystal Medium (≥25 mm2) £850 ea.

*typical representative size, areas/dimensions may vary

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MSDS Documents

Germanium selenide powder MSDSGermanium selenide powder

Germanium selenide crystal MSDSGermanium selenide crystal

Structure of Germanium Selenide

Germanium selenide (GeSe) belongs to the Group IV layered metal mono-chalcogenides. It has a similar structure to phosphorene, and crystallises in a highly anisotropic layered orthorhombic (distorted NaCl-type) crystal structure with Pnma symmetry. Each primitive unit cell of the orthorhombic crystal structure contains eight atoms organised in adjacent double-puckered layers. The atoms in each double puckered layer bond to their three nearest neighbours by covalent bonds and form a zigzag chain along the direction of the minor axis of the crystal.

germanium selenide crystal structure - GeSe
Top and side view of single-layer germanium selenide (GeSe)

Literature and Reviews

  • Electronic structure of germanium selenide investigated using ultra-violet photoelectron spectroscopy, P Mishra et al., Semicond. Sci. Technol., 30, 075001 (2015); doi:10.1088/0268-1242/30/7/075001.
  • Structural and electronic properties of atomically thin germanium selenide polymorphs, S. Zhang et al., Sci China Mater., 58: 929–935 (2015); doi: 10.1007/s40843-015-0107-5.
  • Layered material GeSe and vertical GeSe/MoS2 p-n heterojunctions, W. Yap et al., Nano Res., 11(1): 420–430 (2018); doi: 10.1007/s12274-017-1646-8.

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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