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Modeling selective-area growth of InAsSb nanowires.

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  • 1ITMO University, Kronverkskiy pr. 49, 197101 St. Petersburg, Russia.

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|March 27, 2019
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Antimony flux controls the shape of indium arsenide antimonide semiconductor nanowires. Higher antimony flux leads to wider, shorter nanowires, forming nano-disks, due to indium adatom diffusion. This impacts semiconductor materials science.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Semiconductor Physics

Background:

  • Catalyst-free semiconductor nanowires are crucial for advanced electronic devices.
  • Controlling nanowire morphology is essential for tuning their properties.
  • Indium arsenide antimonide (InAsSb) offers tunable bandgaps for infrared applications.

Purpose of the Study:

  • To develop an analytical model explaining how antimony fractional flux influences InAsSb nanowire morphology.
  • To investigate the growth mechanism of catalyst-free InAsSb nanowires using selective-area vapor-solid (SAVS) method.
  • To understand the role of indium adatom diffusion in nanowire shape evolution.

Main Methods:

  • Growth of InAsSb nanowires on Si (111) substrates via molecular beam epitaxy (MBE).
  • Utilizing the selective-area vapor-solid (SAVS) mechanism for catalyst-free growth.
  • Development and application of an analytical growth model based on adatom diffusion.

Main Results:

  • Increasing antimony fractional flux promoted radial growth over axial growth.
  • High antimony flux resulted in the formation of 'nano-disk' morphologies.
  • The analytical model successfully explained the observed morphology changes attributed to indium adatom diffusion.

Conclusions:

  • Antimony fractional flux is a key parameter for controlling InAsSb nanowire morphology.
  • Indium adatom diffusion along nanowire facets governs the transition from nanowires to nano-disks.
  • The findings provide insights for designing and fabricating nanostructures with desired shapes and properties.