GeSe (Germanium Selenide)

GeSe Germanium Selenide GeSe is a semiconductor with an indirect band gap ~1.1 eV. The layers are stacked together via van der Waals interactions and can be exfoliated into thin 2D layers. Germanium Selenide belongs to the group-VI transition metal monochalcogenides. To buy GeSe crystals please click here.

The GeSe crystals produced at HQ Graphene have a typical lateral size of ~0.6-0.8 cm, are rectangular shaped and have a metallic appearance.

GeSe crystal properties
Crystal size ~6-8 mm
Electrical properties Semiconductor
Crystal structure Orthorhombic
Unit cell parameters a = 0.383 nm, b = 0.440 nm, c = 1.078 nm, α = β = γ = 90°
Monolayer properties Link to C2DB containing calculated properties
Type Synthetic
Purity >99.995 %
Characterized by XRD, Raman, EDX
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The single crystal GeSe is characterized using:

XRD: single crystal and powder X-ray diffraction (D8 Venture Bruker and D8 Advance Bruker)
EDX: Energy-dispersive X-ray spectroscopy for stoichiometric analysis
Raman: 785 nm Raman system

Raman, XRD and EDX on GeSe:

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X-ray diffraction on a GeSe single crystal aligned along the (100) plane. XRD was performed at room temperature using a D8 Venture Bruker. The 4 XRD peaks correspond, from left to right, to (h00) with h = 2, 4, 6, 8

Powder X-ray diffraction (XRD) of a single crystal GeSe. X-ray diffraction was performed at room temperature using a D8 Venture Bruker.

Stoichiometric analysis of a single crystal GeSe by Energy-dispersive X-ray spectroscopy (EDX).

Raman spectrum of a single crystal GeSe. Measurement was performed with a 785 nm Raman system at room temperature.

HQ Graphene Wiki on:

GeSe (Germanium selenide)

1. Chen, Z., et al. "Ultrafast dynamics with time-resolved ARPES: photoexcited electrons in monochalcogenide semiconductors." Comptes Rendus. Physique 22.S2 (2021): 1-8.

2. Yan, B., et al. "Preparation and photoelectric characterization of p-GeSe/p-WS2 heterojunction devices." Journal of Physics D: Applied Physics 55.32 (2022): 325101.

3. Afzal, A.M., et al. "Ultrafast and highly stable photodetectors based on p-GeSe/n-ReSe2 heterostructures." ACS Applied Materials & Interfaces 13.40 (2021): 47882-47894.

4. Grodzicki, M., et al. "Band Alignments of GeS and GeSe Materials." Crystals 12.10 (2022): 1492.


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