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Related Concept Videos

Field Effect Transistor01:29

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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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Polar Organic Gate Dielectrics for Graphene Field-Effect Transistor-Based Sensor Technology.

Kevin A Kam1, Brianne I C Tengan2, Cody K Hayashi3

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Sensors (Basel, Switzerland)
|August 26, 2018
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Summary

Researchers explored polar organic liquids as alternatives to solid dielectrics in graphene field-effect transistors (GFETs). Dimethyl sulfoxide (DMSO) demonstrated superior performance, achieving high charge carrier mobilities in GFET devices.

Keywords:
flexible graphene-based sensor technologygraphene field-effect transistorspolar organic dielectrics

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Organic Electronics

Background:

  • Traditional rigid gate-dielectrics in graphene field-effect transistors (GFETs) present fabrication challenges.
  • Liquid polar organic molecules offer a novel approach due to their high net dipole moments.

Purpose of the Study:

  • To investigate the efficacy of various polar organic liquids as gate dielectrics in GFETs.
  • To compare the performance of dimethyl sulfoxide (DMSO), acetonitrile, propionamide, and valeramide.

Main Methods:

  • Fabrication of GFETs utilizing different polar organic liquid dielectrics.
  • Electrical characterization of GFETs to determine performance metrics.
  • Analysis of the electrical double layer formation at the liquid-graphene interface.

Main Results:

  • Dimethyl sulfoxide (DMSO) as a liquid dielectric resulted in enhanced GFET performance.
  • Achieved high electron and hole mobilities of 154.0 cm²/Vs and 154.6 cm²/Vs, respectively.
  • Demonstrated a low Dirac voltage of less than 5 V.

Conclusions:

  • Polar organic liquids, particularly DMSO, are effective alternatives to rigid dielectrics for GFET fabrication.
  • The high capacitance of the electrical double layer at the liquid-graphene interface facilitates conductivity modulation.
  • This approach offers a promising route for developing advanced GFET devices.