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Related Concept Videos

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 Transistor

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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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Phase Diagrams02:39

Phase Diagrams

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A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
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Phase Transitions02:31

Phase Transitions

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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Inductance: Single-Phase And Three-Phase Line01:28

Inductance: Single-Phase And Three-Phase Line

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Understanding the inductance of transmission lines is crucial for efficient design and operation in electrical power systems. This discussion delves into the inductance characteristics of single-phase two-wire and three-phase three-wire transmission lines with equal phase spacing.
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Capacitance: Single-Phase And Three-Phase Line01:25

Capacitance: Single-Phase And Three-Phase Line

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In electrical power systems, understanding the capacitance of transmission lines is fundamental for efficient operation.
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Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors
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Phase Modulators Based on High Mobility Ambipolar ReSe2 Field-Effect Transistors.

Nihar R Pradhan1,2, Carlos Garcia3,4, Bridget Isenberg3,5

  • 1Department of Chemistry, Physics and Atmospheric Sciences, Jackson State University, Jackson, MS, 39217, USA. nihar.r.pradhan@jsums.edu.

Scientific Reports
|August 26, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed thicker rhenium diselenide (ReSe2) field-effect transistors (FETs) exhibiting high carrier mobility and low operating voltage. These ambipolar FETs show potential for creating advanced logic elements and phase modulators.

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Preparation of Silicon Nanowire Field-effect Transistor for Chemical and Biosensing Applications
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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Ambipolar field-effect transistors (FETs) are crucial for advanced electronic devices.
  • Rhenium diselenide (ReSe2) has shown promise for electronic applications, but its performance in FETs needs further optimization.

Purpose of the Study:

  • To fabricate and characterize ambipolar FETs using multi-layered triclinic ReSe2.
  • To investigate the effect of layer thickness on FET performance, including carrier mobility and operating voltage.
  • To explore the potential of ReSe2 FETs in constructing logical elements and phase modulators.

Main Methods:

  • Mechanical exfoliation of multi-layered triclinic ReSe2 onto SiO2/p-doped Si substrates.
  • Fabrication of field-effect transistors (FETs) using the exfoliated ReSe2 layers.
  • Electrical characterization of the FETs to determine carrier mobility, threshold voltage, and ON/OFF current ratios.
  • Demonstration of logical element functionalities, including gate-voltage tunable phase modulators.

Main Results:

  • Achieved field-effect carrier mobilities exceeding 10^2 cm^2/Vs at room temperature in ~10 atomic layer ReSe2 FETs.
  • Observed nearly zero threshold gate voltage and high ON to OFF current ratios in thicker ReSe2 FETs compared to thinner ones.
  • Successfully demonstrated the fabrication of simple, gate-voltage tunable phase modulators capable of shifting signal phase by 90° or 180°.

Conclusions:

  • Thicker multi-layered ReSe2 FETs offer superior performance characteristics (higher mobility, lower operating voltage) compared to thinner layers.
  • The ambipolar nature of ReSe2 enables its use in constructing digital logic elements and tunable phase modulators.
  • Further improvements in ReSe2 FET performance are anticipated with advanced architectures, such as using hexagonal boron nitride (h-BN) substrates.