Can antimonide-based nanowires form wurtzite crystal structure?

Area of Science:

• Materials Science
• Nanotechnology
• Semiconductor Physics

Background:

• Antimonide-based nanowires are crucial for applications like long-wavelength infrared detectors.
• These nanowires typically crystallize in the zinc blende (ZB) structure, unlike other III-V nanowires that favor the wurtzite (WZ) phase.
• Achieving the WZ phase in antimonide nanowires presents significant challenges and is underexplored.

Purpose of the Study:

• To investigate the controlled formation of WZ InSb and GaSb nanowires.
• To explore the possibility of achieving non-ZB crystal structures (WZ, 4H) in binary antimonide nanowires.
• To understand the fundamental mechanisms governing WZ growth in Au-seeded antimonide nanowires.

Main Methods:

• Utilized metalorganic vapor phase epitaxy (MOVPE) for nanowire growth.
• Examined Au-seeded indium antimonide (InSb) and gallium antimonide (GaSb) nanowires.
• Varied growth conditions to influence crystal structure formation.

Main Results:

• Demonstrated the controlled formation of WZ InSb nanowires.
• Showcased the preferential ZB phase formation in antimonide nanowires, even with WZ-promoting conditions.
• Identified factors influencing crystal phase selection in these systems.

Conclusions:

• Controlled WZ InSb nanowire formation is achievable.
• The study provides fundamental insights into overcoming the ZB preference in antimonide nanowires.
• Findings contribute to the broader understanding of crystal phase control in nanowire epitaxy.