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Tunable Solid State and Flexible Graphene Electronics

We demonstrate tunable solid state and flexible graphene field effect devices (FEDs) fabricated using a poly(methylmethacrylate) (PMMA) and lithium fluoride (LiF) composite dielectric. Increasing the concentration of LiF in the composite dielectric reduces the operating gate voltages significantly from 10 V to 1 V required leading to a decrease in resistance. Electron and hole mobility of 350 and 310 cm2/Vs at VD = -5 V are obtained for graphene FEDs with 10 % LiF concentration in the composite. Using composite dielectric also enabled excellent performance on flexible substrates without any significant change in mobility and resistance. Flexible FEDs with only 5 % and 12 % variation in mobility for 300 and 750 bending are obtained.

preprint2014arXivOpen access
Arunandan KumarPriyanka TyagiRitu Srivastava
cond-mat.mes-hallcond-mat.mtrl-sci
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Arunandan KumarPriyanka TyagiRitu Srivastava

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