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Related Concept Videos

Biasing of FET01:22

Biasing of FET

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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.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the...
340
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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P-N junction01:11

P-N junction

605
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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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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MOSFET: Depletion Mode01:20

MOSFET: Depletion Mode

440
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.
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity...
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MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

433
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.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
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Related Experiment Video

Updated: Aug 16, 2025

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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Simple Ge/Si bilayer junction-based doping-less tunnel field-effect transistor.

Min-Won Kim1, Ji-Hun Kim1, Hyeon-Jun Kim1

  • 1Department of Electronic Engineering, Hanyang University, Seoul, Republic of Korea.

Nanotechnology
|December 21, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces doping-less tunnel field-effect transistors (DL-TFETs) using a Ge/Si bilayer to overcome random dopant fluctuation issues and enhance performance for low-power electronics.

Keywords:
Ge condensationcharge plasmasilvaco atlastunnel field-effect transistor

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Area of Science:

  • Semiconductor device physics
  • Advanced materials for electronics

Background:

  • Tunnel field-effect transistors (TFETs) offer low off-current and fast switching for low-power applications.
  • Conventional doped TFETs suffer from random dopant fluctuation (RDF), leading to threshold voltage variations and leakage.

Purpose of the Study:

  • To develop a doping-less TFET (DL-TFET) approach using a Ge/Si bilayer to mitigate RDF and improve performance.
  • To investigate the impact of Ge/Si junction boundary position and Ge content on DL-TFET electrical characteristics.

Main Methods:

  • Utilized the Silvaco Atlas device simulator for the development and analysis of charge plasma-based DL-TFETs.
  • Incorporated a Ge/Si bilayer structure within the TFET design.

Main Results:

  • The Ge/Si bilayer structure significantly enhanced the on-current to 1.4 × 10-6A.
  • Achieved a steep subthreshold swing of 16.6 mV dec-1, indicating improved switching characteristics.
  • Systematic examination of junction boundary and Ge content provided insights into electrical behavior.

Conclusions:

  • The developed Ge/Si bilayer DL-TFET effectively addresses RDF issues inherent in conventional TFETs.
  • This approach shows promise for high-performance, low-power electronic devices by improving on-current and subthreshold swing.