GaSe (2H phase Gallium Selenide)

GaSe Gallium Selenide GaSe (2H phase) is a semiconductor with an indirect band gap of ~2.1 eV. GaSe has been used as a semiconductor, photoconductor, a second harmonic generation crystal in nonlinear optics and as a far-infrared conversion material. The layers are stacked together via van der Waals interactions and can be exfoliated into thin 2D layers. GaSe belongs to the group-13 post-transition metal monochalcogenides. To buy GaSe crystals please click here.

The 2H phase of Gallium Selenide has a typical lateral size of ~0.6-0.8 cm and has a dark-copper metallic appearance.

2H phase GaSe crystal properties
Crystal size ~8 mm
Electrical properties Semiconductor
Crystal structure Hexagonal
Unit cell parameters a = b = 0.374 nm, c = 1.592 nm, α = β = 90°, γ =120°
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 GaSe 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 GaSe:

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X-ray diffraction on a GaSe single crystal aligned along the (001) plane. XRD was performed at room temperature using a D8 Venture Bruker. The 5 XRD peaks correspond, from left to right, to (001) with h = 4, 6, 8, 10, 12

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

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

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

HQ Graphene Wiki on:

GaSe (Gallium selenide)

1. Maeso, David, et al. "Strong modulation of optical properties in rippled 2D GaSe via strain engineering." Nanotechnology 30.24 (2019): 24LT01.

2. Ryousuke, Ishikawa, et al. "Photovoltaic Characteristics of GaSe/MoSe 2 Heterojunction Devices." Nanoscale Research Letters 16.1 (2021).

3. Guo, Feng, et al. "Multifunctional optoelectronic synapse based on ferroelectric van der Waals heterostructure for emulating the entire human visual system." Advanced Functional Materials 32.6 (2022): 2108014.


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