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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 Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) plays a pivotal role in modern electronics thanks to its versatility and efficiency in controlling electrical currents. This device, also known as IGFET, MISFET, and MOSFET, has three main terminals: the Source, Drain, and Gate. MOSFETs are classified into n-channel or p-channel types based on the doping characteristics of their substrate and the source or drain regions.
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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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Nanometer-Thick Oxide Semiconductor Transistor with Ultra-High Drain Current.

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Summary

We developed an Indium Oxide (In2O3) transistor using atomic layer deposition (ALD) that achieves a record high drive current of over 10 A/mm. This breakthrough in semiconductor devices offers superior performance for high-speed electronics.

Keywords:
atomic layer depositionback-end-of-line compatibilitycharge neutrality levelnanometer-thick transistoroxide semiconductorultrahigh current

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Semiconductor Device Engineering

Background:

  • High drive current is essential for advanced semiconductor applications, including high-speed logic and radio frequency (RF) systems.
  • Existing transistors often face limitations in achieving both high speed and efficiency simultaneously.
  • Indium Oxide (In2O3) presents a promising material for next-generation transistors due to its unique electronic properties.

Purpose of the Study:

  • To demonstrate an In2O3 transistor grown via atomic layer deposition (ALD) at back-end-of-line (BEOL) compatible temperatures.
  • To achieve record-breaking drive current and transconductance in a planar field-effect transistor (FET) structure.
  • To investigate the fundamental transport properties contributing to the enhanced performance of ALD In2O3 transistors.

Main Methods:

  • Fabrication of In2O3 transistors using atomic layer deposition (ALD) at temperatures compatible with back-end-of-line (BEOL) processes.
  • Experimental characterization including Hall measurements, I-V (current-voltage) sweeps, and split C-V (capacitance-voltage) measurements at room temperature.
  • Theoretical analysis using density functional theory (DFT) to understand carrier density, electron velocity, and band structure effects.
  • Implementation of ultrafast pulse schemes and heat dissipation engineering to enable high carrier concentration and velocity measurements.

Main Results:

  • Achieved a record high drive current exceeding 10 A/mm in a planar In2O3 FET, significantly outperforming existing semiconductor channel transistors.
  • Demonstrated a high transconductance of 4 S/mm, among the highest recorded for planar transistor structures.
  • Confirmed experimentally and theoretically a high carrier density (6-7 × 10^13 /cm^2) and high electron velocity (approx. 10^7 cm/s).
  • Identified the high-quality oxide/oxide interface, metal-like charge-neutrality-level (CNL) alignment, and low density-of-state (DOS) as key factors for high performance.

Conclusions:

  • ALD In2O3 transistors offer a pathway to significantly enhance drive current and transconductance for advanced electronic applications.
  • The achieved performance is attributed to a combination of high carrier density, high electron velocity, and favorable material properties.
  • This work establishes In2O3 as a superior channel material for high-performance planar transistors, particularly when fabricated using BEOL-compatible ALD.