Zn(1-x)Mg(x)Te nanowires grown by solid source molecular beam epitaxy.

Area of Science:

• Materials Science
• Nanotechnology
• Semiconductor Physics

Background:

• Ternary semiconductor alloys offer tunable electronic and optical properties.
• Nanowires provide unique quantum confinement and high surface-area-to-volume ratios.
• Controlled synthesis of ternary nanowires is crucial for advanced device applications.

Purpose of the Study:

• To report the epitaxial growth of single-crystalline ternary Zn(1-x)Mg(x)Te nanowires.
• To cover a broad compositional range (0≤x≤0.75) of Zn(1-x)Mg(x)Te.
• To investigate the structural and compositional properties of the synthesized nanowires.

Main Methods:

• Vapor-liquid-solid (VLS) mechanism utilizing solid-source molecular beam epitaxy (MBE).
• Employing an Au-based nanocatalyst for nanowire initiation.
• Growth on various GaAs substrates ((100), (110), (111)).

Main Results:

• Achieved epitaxial growth of single-crystalline Zn(1-x)Mg(x)Te nanowires with diameters of 30-70 nm and lengths of ~1 µm.
• Demonstrated composition control by adjusting Mg to Zn molecular beam flux ratios.
• Confirmed zinc-blende structure and [Formula: see text] growth axis across the entire composition range via XRD and TEM.
• Raman spectroscopy confirmed Mg incorporation into ZnTe lattice sites through phonon line shifts.

Conclusions:

• Successfully synthesized Zn(1-x)Mg(x)Te nanowires with tunable compositions and controlled crystal structure.
• The findings demonstrate the feasibility of using MBE for producing ternary semiconductor nanowires for potential applications.
• The substitutional incorporation of Mg is confirmed, paving the way for exploring their electronic and optical properties.