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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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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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Metal-oxide-semiconductor field-effect Transistors, or MOSFETs, play a critical role in electronic circuits. They are primarily utilized for amplifying and switching signals.
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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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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
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Reversible Thickness Engineering in Amorphous In2O3 Transistors.

Yi-Yu Pan1, Chu-Hsiu Hsu2, Robert Tseng1

  • 1Institute of Electronics, National Yang Ming Chiao Tung University, Hsinchu 300093, Taiwan.

Nano Letters
|April 13, 2026
PubMed
Summary
This summary is machine-generated.

This study demonstrates reversible, atomic-scale thickness control of amorphous indium oxide (In2O3) films. This breakthrough enables precise tuning of semiconductor device performance and paves the way for reconfigurable electronics.

Keywords:
In2O3bottom-up processdoping-freeoxide semiconductorsthickness controlthreshold voltagetop-down process

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Area of Science:

  • Materials Science
  • Semiconductor Physics
  • Nanotechnology

Background:

  • Amorphous oxide semiconductors offer advantages in device processing due to their noncrystalline nature.
  • This enables low-temperature processing and eliminates lattice-matching requirements at interfaces.

Purpose of the Study:

  • To demonstrate atomic-scale, reversible thickness control of amorphous indium oxide (In2O3) films.
  • To leverage chemical continuity for precise film modulation.
  • To establish film thickness as a key design parameter for oxide semiconductors.

Main Methods:

  • Integration of bottom-up atomic layer deposition with top-down hydroxide-assisted wet-etching.
  • Bidirectional modulation of In2O3 film thickness between 1 and 4 nm.
  • Maintaining smooth surfaces (Ra ≈ 0.5 nm) and stable chemical composition.

Main Results:

  • Achieved reversible, atomic-scale thickness control of amorphous In2O3 films.
  • Demonstrated thickness-dependent control over In2O3 transistor performance.
  • Enabled doping-free modulation of threshold voltage and reversible switching between depletion and enhancement modes.
  • Successfully demonstrated inverters and ring oscillators.

Conclusions:

  • The thinning-regrowth process offers precise control over amorphous oxide semiconductor properties.
  • Film thickness is established as a critical design parameter for oxide semiconductors.
  • This technique paves the way for developing reconfigurable electronic devices.