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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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Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
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Carrier Transport01:21

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The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
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Biasing of FET01:22

Biasing of FET

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Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
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Carrier Generation and Recombination01:22

Carrier Generation and Recombination

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Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
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The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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InGaAs Inversion Layer Mobility and Interface Trap Density from Gated Hall Measurements.

T Chidambaram1, D Veksler2, S Madisetti1

  • 1SUNY Polytechnic Institute, Albany, NY 12203, USA.

IEEE Electron Device Letters : a Publication of the IEEE Electron Devices Society
|October 31, 2024
PubMed
Summary
This summary is machine-generated.

The gated Hall method accurately measures free carrier density and electron mobility in InGaAs MOSFETs. This technique reveals significant underestimation by C-V methods and highlights the impact of border traps on electron transport.

Keywords:
III-V MOSFETscarrier densityinterface statesmobilityscattering mechanism

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Area of Science:

  • Semiconductor Physics
  • Materials Science

Background:

  • Indium Gallium Arsenide (InGaAs) Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs) are crucial for high-speed electronics.
  • Accurate characterization of carrier transport properties and interface quality is essential for device optimization.
  • Conventional capacitance-voltage (C-V) methods often overestimate channel carrier density, leading to inaccurate mobility estimations.

Purpose of the Study:

  • To directly measure free carrier density and electron mobility in InGaAs MOSFET channels using the gated Hall method.
  • To compare the accuracy of the gated Hall method with transistor characteristics and C-V measurements.
  • To investigate the impact of interface traps, including border traps, on carrier transport in InGaAs MOSFETs.

Main Methods:

  • Direct measurement of free carrier density and electron mobility via the gated Hall method.
  • Analysis of temperature-dependent electron mobility to identify scattering mechanisms.
  • Separation of free carriers and trapped charges using the gated Hall technique for reliable interface trap density estimation.

Main Results:

  • Highest Hall mobility of 1800 cm²/Vs observed at an electron density of approximately 1×10¹² cm⁻² at room temperature.
  • Significant underestimation of mobility by C-V measurements due to overestimated channel density.
  • Remote Coulomb scattering identified as the dominant mechanism at electron densities below 3×10¹¹ cm⁻².
  • Reliable estimation of interface trap density, including border traps, at the III-V/high-k interface.

Conclusions:

  • The gated Hall method provides accurate measurements of carrier density and mobility in InGaAs MOSFETs, surpassing C-V methods.
  • Fast border traps above the conduction band significantly impact InGaAs channels, trapping up to half of the channel electrons.
  • These trapped charges increase switching energy and power dissipation, unlike in Silicon (Si) devices where border trap effects are negligible.