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MOSFET: Enhancement Mode01:22

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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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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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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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MOSFET: Depletion Mode01:20

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Depletion-mode MOSFETs represent a unique subset of MOSFET technology, functioning fundamentally differently from their enhancement-mode counterparts. Unlike enhancement MOSFETs, which require a positive gate-source voltage (Vgs) to turn on, depletion-mode MOSFETs are inherently conductive and "normally on" devices.
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Chip-Scale Graphene/IGZO Cold Source FET Array Enabling Sub-60 mV dec-1 Super-Steep Subthreshold Swing.

Seyoung Oh1,2, Ojun Kwon1,2, Jongwon Yoon3

  • 1Department of Advanced Materials Engineering, Chungbuk National University, Chungdae-ro 1, Seowon-Gu, Cheongju, Chungbuk, 28644, Republic of Korea.

Advanced Materials (Deerfield Beach, Fla.)
|September 3, 2025
PubMed
Summary

Researchers achieved a record-breaking sub-60 mV/dec super-steep subthreshold swing (SS) in graphene/InGaZnO (IGZO) cold-source field-effect transistor (CSFET) arrays. This breakthrough enables ultralow off-current and paves the way for high-speed, low-power electronics.

Keywords:
chip‐scale FET arrayscold‐source field‐effect transistordirac‐cone‐type energy band structuregraphene/IGZOsub‐60 mV dec−1 super‐steep subthreshold swing

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Area of Science:

  • Materials Science
  • Semiconductor Physics
  • Electronics Engineering

Background:

  • Achieving steep subthreshold swing (SS) is crucial for low-power electronics.
  • Traditional transistors face limitations in reducing SS due to thermal effects.

Purpose of the Study:

  • To demonstrate a super-steep subthreshold swing (SS) below 60 mV/decade in graphene/InGaZnO (IGZO) cold-source field-effect transistor (CSFET) arrays.
  • To investigate the impact of graphene's electronic properties and high-k dielectrics on SS performance.

Main Methods:

  • Fabrication of graphene/IGZO CSFET arrays.
  • Utilizing the linear density of states of Dirac-cone graphene to suppress thermal effects.
  • Incorporation of HfO2 high-k dielectric with a low body factor for surface potential modulation.

Main Results:

  • Demonstrated the first sub-60 mV/decade SS in graphene/IGZO CSFET arrays.
  • Achieved a record SS value of 23.66 mV/decade.
  • Obtained high uniformity with ≈89.1% yield for sub-60 mV/decade SS in 8x8 arrays.
  • Observed super-exponential decay of electron density due to suppressed Boltzmann tail.

Conclusions:

  • Graphene's unique electronic properties are effective in achieving ultra-low SS and off-current.
  • HfO2 high-k dielectric further enhances SS performance.
  • The developed IGZO CSFET technology promises advancements in high-speed and ultralow-power electronic circuits.