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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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The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
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In small-signal analysis, a MOSFET transistor amplifier acts as a linear amplifier when operating in its saturation region. The gate-to-source voltage (VGS) of the MOSFET is the sum of the DC biasing voltage and the small time-varying input signal. This combination sets up the operating point and modulates the drain current (ID) that flows from the drain to the source. When a small AC signal is superimposed on the DC bias voltage at the gate, the instantaneous drain current comprises three...
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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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Microelectronic current-sourcing device based on band-to-band tunneling current.

Onejae Sul1, Yeonghun Lee2, Sangduk Kim2

  • 1Institute of Nano Science and Technology, Hanyang University, Seoul, Republic of Korea.

Nanotechnology
|October 3, 2022
PubMed
Summary

Researchers developed a novel stable current-sourcing transistor utilizing band-to-band tunneling in WS2/Si heterojunctions. This innovation enables ultralow power consumption for advanced electronic applications.

Keywords:
band-to-band tunnelingheterojunctionsilicontransistortransition metal dichalcogenide

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Area of Science:

  • Semiconductor device physics
  • Materials science
  • Nanotechnology

Background:

  • Band-to-band tunneling (BTBT) is a quantum mechanical phenomenon crucial for advanced semiconductor devices.
  • Tungsten disulfide (WS2) is a promising 2D material for next-generation electronics.
  • Achieving stable current sourcing with low power consumption remains a key challenge in transistor design.

Purpose of the Study:

  • To develop a novel stable current-sourcing transistor.
  • To leverage the band-to-band tunneling phenomenon for device operation.
  • To explore the use of WS2 and silicon heterojunctions for enhanced transistor performance.

Main Methods:

  • Fabrication of a heterojunction device using thin-film WS2 and heavily hole-doped bulk silicon.
  • Engineering the WS2 channel to create both electron-doped and hole-doped regions.
  • Utilizing gate bias to control tunneling barrier thickness for device switching.

Main Results:

  • Demonstrated a stable current-sourcing transistor based on band-to-band tunneling.
  • Output current is effectively regulated by tunneling barrier thickness, controlled by gate bias.
  • Achieved minimum line sensitivity of 2.6% and a temperature coefficient of 1.4 × 10^3 ppm/°C.
  • Device exhibits ultralow output current and power consumption.

Conclusions:

  • The developed WS2/Si heterojunction transistor successfully utilizes band-to-band tunneling for stable current sourcing.
  • The device's unique operating principle allows for low power consumption and stable performance.
  • This technology holds potential for applications requiring efficient and reliable current sourcing.