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Related Concept Videos

MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

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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MOSFET: Depletion Mode01:20

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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.
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Biasing of FET01:22

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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.
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Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
10:36

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Published on: April 12, 2018

Tunable and Selective Doping Modulation in Pd-Filled Carbon Nanotube Transistors.

Haoyan Liang1, Yu Teng2, Jian Yao2

  • 1School of Physical Science and Technology, ShanghaiTech University, Shanghai, China.

Small (Weinheim an Der Bergstrasse, Germany)
|July 6, 2026
PubMed
Summary

A new method uses palladium encapsulation and electron-beam irradiation for precise doping control in single-walled carbon nanotube (SWCNT) electronics. This technique enhances device performance, overcoming key challenges in carbon-based electronics.

Keywords:
Pd‐Filledcarbon nanotubesfield‐effect‐transistorstunable doping

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electronics Engineering

Background:

  • Doping is crucial for single-walled carbon nanotube (SWCNT) electronics but remains challenging due to the stable sp2 carbon network.
  • Developing reliable doping strategies and control methods for SWCNTs is essential for advancing carbon-based electronics.

Purpose of the Study:

  • To establish a controllable doping strategy for SWCNTs by combining palladium (Pd) encapsulation with electron-beam (e-beam) irradiation.
  • To achieve precise doping modulation and enable tunable, reversible doping control in SWCNTs.

Main Methods:

  • A novel approach combining Pd encapsulation with e-beam irradiation was developed for SWCNT doping.
  • The acceleration voltage of the e-beam was used to modulate the p-type doping introduced by Pd encapsulation.
  • SWCNT transistors were fabricated with heavily doped contacts and a lightly doped channel.

Main Results:

  • The combined Pd encapsulation and e-beam irradiation strategy enabled tunable doping control from lightly to heavily doped states.
  • SWCNT transistors demonstrated significantly improved performance compared to pristine devices.
  • Contact resistance was reduced by half to 23 kΩ·µm⁻¹, on-current increased approximately fourfold to 24 µA·µm⁻¹, and on/off ratio exceeded 10⁷.

Conclusions:

  • The developed strategy offers an effective approach to overcome challenges in efficient doping for carbon-based electronics.
  • Precise doping modulation using Pd encapsulation and e-beam irradiation enhances SWCNT device performance significantly.
  • This method paves the way for advanced SWCNT electronics with improved contact and channel properties.