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Types of Semiconductors

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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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Field Effect Transistor

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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Preparation of Silicon Nanowire Field-effect Transistor for Chemical and Biosensing Applications
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Preparation of Silicon Nanowire Field-effect Transistor for Chemical and Biosensing Applications

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Silicene field-effect transistors operating at room temperature.

Li Tao1, Eugenio Cinquanta2, Daniele Chiappe2

  • 1Microelectronics Research Centre, The University of Texas at Austin, Texas 78758, USA.

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|February 3, 2015
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Summary
This summary is machine-generated.

Researchers developed a stable silicene field-effect transistor, demonstrating ambipolar Dirac charge transport. This breakthrough enables future nanoelectronic devices using this graphene-like material, overcoming air stability challenges.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Silicene, a silicon allotrope analogous to graphene, possesses a buckled honeycomb structure and a Dirac bandstructure.
  • Its unique properties, including tunable bandgap and surface sensitivity, offer potential for advanced nanoelectronic devices.
  • Previous research faced challenges due to silicene's air instability, hindering experimental device realization.

Purpose of the Study:

  • To report the first experimental silicene field-effect transistor (FET).
  • To demonstrate ambipolar Dirac charge transport in silicene FETs.
  • To present a novel fabrication process for air-sensitive 2D materials.

Main Methods:

  • Developed a "silicene encapsulated delamination with native electrodes" process for material transfer and device fabrication.
  • Fabricated a free-standing silicene field-effect transistor.
  • Measured room-temperature charge transport properties.

Main Results:

  • Successfully demonstrated a silicene field-effect transistor with ambipolar Dirac charge transport.
  • Achieved a room-temperature charge carrier mobility of approximately 100 cm²/Vs.
  • Attributed transport limitations to acoustic phonon scattering and grain boundaries.
  • The novel fabrication method ensures material preservation during transfer.

Conclusions:

  • The developed fabrication process overcomes the air stability issue of silicene, enabling experimental device realization.
  • Silicene FETs exhibit promising electronic properties for future nanoelectronics, with potential for integration into silicon technology.
  • The fabrication technique is applicable to other sensitive 2D materials like germanene and phosphorene.