6533b838fe1ef96bd12a3b3d

RESEARCH PRODUCT

Tunable field effect properties in solid state and flexible graphene electronics on composite high – low k dielectric

Arunandan KumarPriyanka TyagiPriyanka TyagiJanardan DagarRitu Srivastava

subject

Electron mobilityMaterials sciencebusiness.industryGrapheneComposite numberField effectLithium fluorideLow-k dielectric02 engineering and technologyGeneral ChemistryDielectric010402 general chemistry021001 nanoscience & nanotechnology01 natural sciencesCapacitance0104 chemical scienceslaw.inventionchemistry.chemical_compoundchemistrylawOptoelectronicsGeneral Materials Science0210 nano-technologybusiness

description

We demonstrate tunable field effect properties in 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 increases the capacitance, which thereby reduces the operating gate voltages of FEDs significantly from 10 V to 1 V to achieve similar conductivity. Electron and hole mobility of 350 and 310 cm2/V at VD = −5 V are obtained for graphene FEDs with 10% LiF concentration in the composite. Composite dielectric also enabled excellent FEDs 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.

yearjournalcountryeditionlanguage
2016-04-01Carbon
https://doi.org/10.1016/j.carbon.2015.12.073