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Radial modulation doping in core-shell nanowires.

David C Dillen1, Kyounghwan Kim1, En-Shao Liu1

  • 1Microelectronics Research Center, The University of Texas at Austin, 10100 Burnet Road, Austin, Texas 78758, USA.

Nature Nanotechnology
|January 21, 2014
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Summary
This summary is machine-generated.

Semiconductor nanowires with core-shell structures enable enhanced charge carrier mobility through radial modulation doping. This technique allows precise measurement of valence band offsets, crucial for advanced electronic devices.

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Area of Science:

  • * Materials Science and Nanotechnology
  • * Condensed Matter Physics
  • * Semiconductor Device Physics

Background:

  • * Semiconductor nanowires are promising for quantum computing and transistors.
  • * Atomically flat interfaces in nanowire heterostructures allow band engineering.
  • * Core-shell nanowires offer carrier confinement and reduced surface scattering.

Purpose of the Study:

  • * To demonstrate radial modulation doping in germanium-silicon (Ge-Si) core-shell nanowires.
  • * To develop a method for directly measuring valence band offsets in these structures.
  • * To investigate the impact of doping on carrier mobility and transport properties.

Main Methods:

  • * Fabrication of coherently strained Ge-Si core-shell nanowires.
  • * Incorporation of a boron-doped layer during epitaxial shell growth for radial doping.
  • * Measurement of valence band offsets using carrier transport decoupling.

Main Results:

  • * Achieved radial modulation doping in Ge-Si core-shell nanowires.
  • * Observed enhanced peak hole mobility compared to undoped nanowires.
  • * Demonstrated decoupling of electron transport between core and shell regions.

Conclusions:

  • * Radial modulation doping effectively enhances carrier mobility in nanowire cores.
  • * The observed transport decoupling enables direct valence band offset measurement.
  • * These findings are critical for designing high-performance nanoscale electronic devices.