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Related Concept Videos

Semiconductors01:22

Semiconductors

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
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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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Types of Semiconductors01:20

Types of Semiconductors

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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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What is a Mode?01:07

What is a Mode?

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The mode is one of the commonly used measures of a central tendency. It is defined as the most frequent value in a data set.
There can be more than one mode in a data set if multiple values have the same highest frequency. For instance, suppose that the Statistics exam scores of 20 students are: 50; 53; 59; 59; 63; 63; 72; 72; 72; 72; 72; 76; 78; 81; 83; 84; 84; 84; 90; 93. Here, the mode is 72, as it occurs most frequently, five times.
A data set with two modes is called bimodal. For example,...
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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

1.1K
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
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Bipolar Junction Transistor01:22

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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Related Experiment Video

Updated: Feb 7, 2026

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

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Junctionless versus inversion-mode lateral semiconductor nanowire transistors.

A Veloso1, P Matagne1, E Simoen1

  • 1Imec, Kapeldreef 75, 3001 Leuven, Belgium.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 4, 2018
PubMed
Summary
This summary is machine-generated.

Gate-all-around silicon nanowire field-effect transistors (FETs) offer advanced scaling for CMOS technology. This study reviews doping strategies and compares junctionless versus inversion-mode operation for improved device performance and manufacturability.

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Area of Science:

  • Semiconductor device physics
  • Nanoelectronics
  • Integrated circuit technology

Background:

  • Gate-all-around (GAA) silicon nanowire field-effect transistors (FETs) represent a critical advancement in device scaling.
  • Lateral GAA FETs offer a pathway for continued CMOS scaling with reduced processing and layout disruption compared to traditional methods.

Purpose of the Study:

  • To investigate critical technological challenges in lateral GAA silicon nanowire FETs, focusing on doping strategies.
  • To provide a comprehensive comparison of junctionless versus inversion-mode operation for these devices.
  • To evaluate the impact of different operational modes on device variability, reliability, noise, and DC/RF performance.

Main Methods:

  • Fabrication and characterization of lateral gate-all-around silicon nanowire field-effect transistors.
  • Comparative analysis of junctionless and inversion-mode doping strategies.
  • Evaluation of device performance metrics including variability, reliability, noise, and analog/RF characteristics.

Main Results:

  • Doping strategies significantly impact the operational mode and performance characteristics of GAA nanowire FETs.
  • Junctionless and inversion-mode transistors exhibit distinct trade-offs in terms of variability, reliability, and noise performance.
  • Both operational modes show potential for high DC and analog/RF performance, with specific advantages depending on the application.

Conclusions:

  • Lateral GAA silicon nanowire FETs present a viable solution for future CMOS scaling.
  • Careful selection of doping strategies and operational modes is crucial for optimizing device performance and reliability.
  • Further research into manufacturable co-integration options is warranted to fully realize the potential of these advanced devices.