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High Mobility Stemless InSb Nanowires.

Ghada Badawy1, Sasa Gazibegovic1,2, Francesco Borsoi2

  • 1Department of Applied Physics , Eindhoven University of Technology , 5600 MB Eindhoven , The Netherlands.

Nano Letters
|May 17, 2019
PubMed
Summary
This summary is machine-generated.

Chemically pure Indium antimonide (InSb) nanowires (NWs) for quantum devices can now be grown tens of microns long without a foreign stem. This novel method enhances NW purity and electron mobility.

Keywords:
InSbNanowireselectron mobilitygrowth mechanismsmetal organic vapor phase epitaxystemless nanowires

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Area of Science:

  • Semiconductor Nanowire Growth
  • Quantum Device Fabrication
  • Materials Science

Background:

  • High aspect-ratio Indium antimonide (InSb) nanowires (NWs) are crucial for advanced quantum devices.
  • Current InSb NW growth methods often require a foreign material stem, limiting length and purity.

Purpose of the Study:

  • To develop a method for growing chemically pure InSb NWs with high aspect ratios and lengths exceeding previous limitations.
  • To enable direct growth of InSb NWs from a substrate, omitting the need for a foreign nucleation stem.

Main Methods:

  • Utilized a selective-area mask combined with gold catalysis for direct InSb NW nucleation.
  • Investigated novel growth kinetics under Sb-rich conditions.
  • Characterized NW crystal quality and chemical purity.

Main Results:

  • Successfully grew chemically pure InSb NWs tens of microns long, directly from the substrate.
  • Demonstrated high growth rates and suppressed parasitic layer deposition using the selective-area mask.
  • Achieved significantly enhanced low-temperature electron mobility (average 4.4 × 10⁴ cm²/Vs) due to improved NW purity.

Conclusions:

  • The selective-area masking technique enables stem-free growth of high-quality InSb NWs.
  • This advancement is critical for realizing high-performance quantum devices based on InSb NWs.
  • The improved material purity directly translates to superior electronic properties.