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

Sensors
Kevin A KamDavid G Garmire

Abstract

We have pioneered the use of liquid polar organic molecules as alternatives to rigid gate-dielectrics for the fabrication of graphene field-effect transistors. The unique high net dipole moment of various polar organic molecules allows for easy manipulation of graphene's conductivity due to the formation of an electrical double layer with a high-capacitance at the liquid and graphene interface. Here, we compare the performances of dimethyl sulfoxide (DMSO), acetonitrile, propionamide, and valeramide as polar organic liquid dielectrics in graphene field-effect transistors (GFETs). We demonstrate improved performance for a GFET with a liquid dielectric comprised of DMSO with high electron and hole mobilities of 154.0 cm²/Vs and 154.6 cm²/Vs, respectively, and a Dirac voltage <5 V.

References

Sep 25, 2007·Nature Materials·A FasolinoM I Katsnelson
Jun 1, 2010·Nature Nanotechnology·Frank Schwierz
Mar 27, 2012·Theranostics·He ShenZhijun Zhang
Mar 19, 2014·Nature Nanotechnology·Chang-Hua LiuZhaohui Zhong
Jul 15, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Vinayak Narasimhan, Sung-Yong Park
Nov 5, 2015·Nanotechnology·Antonio Di BartolomeoGrzegorz Lupina
Aug 26, 2016·ACS Applied Materials & Interfaces·Jieun KoYoun Sang Kim

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Citations

Jan 17, 2019·Micromachines·Jordan L MelcherDavid Garmire

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