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Field Effect Transistor01:29

Field Effect Transistor

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Field-effect transistors (FETs) are integral to electronic circuits and distinguished by their three-terminal setup: the gate, drain, and source. These transistors operate as unipolar devices, which utilize either electrons or holes as charge carriers, in contrast to bipolar transistors, which use both types of carriers. The primary function of the FET is to modulate the flow of these carriers from the source to the drain through a channel. The voltage difference between the gate and source...
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Bipolar Junction Transistors (BJTs) are essential elements in electronic circuits, playing a crucial role in the functionality of amplifiers, memories, and microprocessors. These transistors can be designed as NPN or PNP based on their doping patterns. They consist of three layers: the emitter, base, and collector. The configuration of these layers and their respective doping levels—with N-type or P-type impurities—define the transistor's type and its operational...
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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: 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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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Black phosphorus field-effect transistors.

Likai Li1, Yijun Yu1, Guo Jun Ye2

  • 1State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China.

Nature Nanotechnology
|March 4, 2014
PubMed
Summary
This summary is machine-generated.

Black phosphorus thin crystals show promise for nanoelectronics. Field-effect transistors fabricated from these two-dimensional materials exhibit reliable room-temperature performance and high charge-carrier mobility.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) crystals are crucial for next-generation electronics.
  • Discovering and characterizing new 2D materials presents significant experimental challenges.
  • Black phosphorus is a layered semiconductor with unique electronic properties.

Purpose of the Study:

  • To investigate the potential of few-layer black phosphorus as a 2D material for nanoelectronic devices.
  • To fabricate and characterize field-effect transistors (FETs) using black phosphorus crystals.
  • To evaluate the performance of these FETs at room temperature.

Main Methods:

  • Fabrication of field-effect transistors using few-layer black phosphorus crystals.
  • Characterization of transistor performance, including drain current modulation and I-V characteristics.
  • Measurement of charge-carrier mobility as a function of crystal thickness.

Main Results:

  • Reliable transistor performance was achieved at room temperature for black phosphorus samples thinner than 7.5 nm.
  • High drain current modulation (on the order of 10^5) and well-developed current saturation were observed.
  • Charge-carrier mobility demonstrated a thickness dependence, with peak values up to ~1,000 cm^2 V^-1 s^-1 at ~10 nm thickness.

Conclusions:

  • Few-layer black phosphorus is a promising new 2D material for nanoelectronic applications.
  • The demonstrated thickness-dependent properties highlight its tunability for device engineering.
  • Black phosphorus FETs offer a viable platform for advanced electronic technologies.