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Related Concept Videos

Field Effect Transistor01:29

Field Effect Transistor

396
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...
396
MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

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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.
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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Tuning Electrode Work Function and Surface Energy for Solution Shearing High-Performance Organic Field-Effect

Congcong Huang1, Chengtai Li1, Bowen Geng1

  • 1Key Laboratory of Organic Integrated Circuits, Ministry of Education & Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China.

ACS Applied Materials & Interfaces
|May 29, 2024
PubMed
Summary

High-performance organic field-effect transistors (OFETs) were developed using solution-processed organic single crystals. Oxygen plasma treatment of gold electrodes improved surface energy and work function, enhancing device performance and enabling commercial applications.

Keywords:
bottom contactorganic field-effect transistorsorganic single crystalsolution shearing techniquetuning of work function

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Area of Science:

  • Materials Science
  • Electronics Engineering
  • Organic Electronics

Background:

  • Bottom-contact organic field-effect transistors (OFETs) are adaptable to lithography but face challenges with solution-processed organic semiconductors.
  • Low surface energy and work function of bare electrodes hinder charge injection and uniform crystal growth.
  • Existing methods struggle to optimize electrode properties for high-performance OFETs.

Purpose of the Study:

  • To enhance the surface energy and work function of gold electrodes for high-performance OFETs.
  • To enable the use of solution-processed organic single crystals in bottom-contact OFET architectures.
  • To develop a straightforward method for fabricating high-quality single-crystal OFETs.

Main Methods:

  • Oxygen plasma treatment was applied to gold electrodes to form a gold oxide layer.
  • Surface energy and work function of treated electrodes were analyzed.
  • Large-area C8-BTBT organic single-crystal thin films were grown using solution shearing.
  • Device performance metrics including carrier mobility and subthreshold swing were measured.

Main Results:

  • Oxygen plasma treatment increased the work function of gold electrodes by approximately 0.7 eV.
  • Enhanced surface energy of electrodes matched the AlOx dielectric, facilitating seamless crystal growth.
  • Achieved the highest carrier mobility of 6.7 cm^2 V^-1 s^-1 for bottom-contact OFETs.
  • Demonstrated sharp switching with a subthreshold swing of 63.6 mV dec^-1 and lower contact resistance (1.19 kΩ cm).

Conclusions:

  • Simultaneous improvement of surface energy and work function of gold electrodes is crucial for high-performance OFETs.
  • Oxygen plasma treatment offers an effective strategy for fabricating high-quality, solution-processed organic single-crystal OFETs.
  • The developed method presents a viable approach for potential commercial applications in organic electronics.