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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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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Published on: August 2, 2019

Enhanced logic performance with semiconducting bilayer graphene channels.

Song-Lin Li1, Hisao Miyazaki, Hidefumi Hiura

  • 1International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan. li.songlin@nims.go.jp

ACS Nano
|December 17, 2010
PubMed
Summary

Creating logic circuits in graphene requires an energy gap (EG). Researchers achieved large EGs in bilayer graphene, enhancing transistor performance and demonstrating novel graphene inverters for future logic applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Graphene electronics face challenges in realizing logic circuits due to the absence of a natural energy gap (EG).
  • Achieving a significant EG is crucial for enhancing the electrical properties of graphene transistors.

Purpose of the Study:

  • To demonstrate the creation of substantial energy gaps in bilayer graphene.
  • To investigate the impact of these energy gaps on graphene transistor performance.
  • To realize complementary-like semiconducting logic graphene inverters.

Main Methods:

  • Utilizing dual-gated bilayer graphene structures.
  • Employing an alumina passivation top gate stack directly contacting graphene channels.
  • Fabricating and characterizing graphene transistors and inverters with engineered energy gaps.

Main Results:

  • Achieved large transport energy gaps (EGs) exceeding 100 meV in dual-gated bilayer graphene.
  • Observed significant enhancements in graphene transistor electrical properties, including on/off current ratio, subthreshold slope, and current saturation.
  • Successfully demonstrated complementary-like semiconducting logic graphene inverters for the first time.

Conclusions:

  • Large energy gaps can be reliably engineered in bilayer graphene using a simple gate stack.
  • Engineered energy gaps substantially improve graphene transistor performance, enabling logic applications.
  • This work paves the way for gap-engineered graphene in advanced logic circuits.