Two-dimensional GeAsSe with high and unidirectional conductivity.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Two-dimensional (2D) materials are gaining significant research interest.
• Layered semiconductor materials offer unique electronic properties.
• Germanium Arsenide Selenide (GeAsSe) is a historically overlooked 2D material.

Purpose of the Study:

• To re-investigate the potential of the 2D layered semiconductor material GeAsSe.
• To evaluate the electronic transport properties of GeAsSe.
• To assess GeAsSe's suitability for nano-electronic applications.

Main Methods:

• Density functional theory (DFT) calculations were employed.
• Cleavage energy and thermal stability of monolayer GeAsSe were determined.
• Electronic transport behavior in different directions was analyzed.
• Conductivity was investigated for monolayer and bilayer GeAsSe.

Main Results:

• Monolayer GeAsSe exhibits low cleavage energy (0.18 J m-2) and high thermal stability (1300 K).
• Unidirectional electronic transport was observed in monolayer GeAsSe, with y-direction mobility 44 times greater than x-direction at 300 K.
• Bilayer GeAsSe shows enhanced unidirectional conductivity, with y-direction conductivity 200 times greater than x-direction (192 cm2 V-1 s-1 vs 0.96 cm2 V-1 s-1).

Conclusions:

• Two-dimensional GeAsSe is a stable material with significant potential.
• The observed unidirectional electronic transport highlights its unique properties.
• GeAsSe is a promising candidate for future nano-electronic device development.