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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.
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Fast Flexible Transistors with a Nanotrench Structure.

Jung-Hun Seo1, Tao Ling2, Shaoqin Gong3

  • 1Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA.

Scientific Reports
|April 21, 2016
PubMed
Summary
This summary is machine-generated.

Nanoimprinting lithography enables fabrication of flexible silicon nanomembrane radio-frequency transistors. These devices achieve a record 38 GHz maximum oscillation frequency, broadening flexible electronics applications.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Nanotechnology

Background:

  • Fabricating submicron patterns on flexible substrates for large-area radio-frequency (RF) applications is challenging.
  • Conventional nanoscale patterning methods like e-beam lithography are not ideal for flexible electronics.
  • Nanoimprinting lithography (NIL) offers a promising route for large-area nanoelectronics, including flexible RF devices.

Purpose of the Study:

  • To develop a generic strategy for high-performance flexible silicon nanomembrane (NM)-based RF thin-film transistors (TFTs).
  • To achieve deep-submicron-scale channel lengths using NIL for enhanced RF performance.
  • To explore the potential of NIL in advancing flexible RF electronics.

Main Methods:

  • Utilized nanoimprinting lithography (NIL) for patterning deep-submicron-scale channel lengths.
  • Employed a unique 3-dimensional etched-trench-channel configuration for TFT fabrication on flexible substrates.
  • Conducted device simulations to optimize parameters and understand device physics.

Main Results:

  • Successfully fabricated flexible Si NM-based RF TFTs with NIL-patterned channels.
  • Demonstrated a record-breaking 38 GHz maximum oscillation frequency (fmax) from TFTs with a 2 μm gate length.
  • Achieved theoretical operation capabilities exceeding 100 GHz.

Conclusions:

  • NIL provides a viable method for fabricating high-performance flexible RF TFTs with fine patterns.
  • The 3D etched-trench-channel design is compatible with flexible substrates and enhances device performance.
  • This advancement significantly broadens the scope of flexible RF applications.