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Gated Hall effect measurements on selectively grown InGaAs nanowires.

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Indium gallium arsenide (InGaAs) nanowires show promise for future transistors. Gated Hall measurements reveal high carrier concentration and mobility, with performance varying by nanowire width.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Semiconductor Physics

Background:

  • Indium gallium arsenide (InGaAs) nanowires are explored as alternatives to silicon for advanced CMOS transistors.
  • Their high electron mobility and electrostatic control in tri-gate structures make them attractive for next-generation electronics.

Purpose of the Study:

  • To investigate the electrical properties of single and multiple InGaAs nanowires using gated Hall measurements.
  • To assess the potential of InGaAs nanowires in junctionless transistor architectures for simplified fabrication.

Main Methods:

  • Selective growth of InGaAs nanowires in a Hall bridge geometry (down to 50 nm width, 10 nm thickness).
  • Gated Hall measurements to analyze carrier concentration and mobility under varying gate voltages.

Main Results:

  • InGaAs nanowires exhibit a high carrier concentration (>10^19 cm^-3) and Hall carrier mobility (~1000 cm^2 V^-1 s^-1).
  • Gate voltage increases carrier concentration, with mobility enhancement observed in narrower nanowires but not in larger ones.

Conclusions:

  • Junctionless transistors based on InGaAs nanowires offer simplified processing for scaled-down devices.
  • The electrical characteristics, particularly mobility, are sensitive to nanowire dimensions and gate modulation.